$win32OS = Get-WmiObject Win32_OperatingSystem -ComputerName "." -EnableAllPrivileges
$win32OS.win32shutdown(4)

Invoke-Command {rundll32.exe user32.dll, LockWorkStation}

Function Lock-Screen
{
  [CmdletBinding()]
  param
  (
    # number of seconds to lock
    [int]
    $LockSeconds = 10,

    # message shown. Use {0} to insert remaining seconds
    # do not use {0} for a static message
    [string]
    $Title = 'wait for {0} more seconds...',
    
    # dim screen
    [Switch]
    $DimScreen
  )

  # when run without administrator privileges, the keyboard will not be blocked!

  # get access to API functions that block user input
  # blocking of keyboard input requires admin privileges
  $code = @'
    [DllImport("user32.dll")]
    public static extern int ShowCursor(bool bShow);

    [DllImport("user32.dll")]
    public static extern bool BlockInput(bool fBlockIt);
'@

  $userInput = Add-Type -MemberDefinition $code -Name Blocker -Namespace UserInput -PassThru

  # get access to UI functionality
  Add-Type -AssemblyName PresentationFramework
  Add-Type -AssemblyName PresentationCore
  
  # set window opacity
  $opacity = 1
  if ($DimScreen) { $opacity = 200 }
  
  # create a message label
  $label = New-Object -TypeName Windows.Controls.Label
  $label.FontSize = 60
  $label.FontFamily = 'Consolas'
  $label.FontWeight = 'Bold'
  $label.Background = 'Transparent'
  $label.Foreground = 'Blue'
  $label.VerticalAlignment = 'Center'
  $label.HorizontalAlignment = 'Center'
  
  
  # create a window
  $window = New-Object -TypeName Windows.Window
  $window.WindowStyle = 'None'
  $window.AllowsTransparency = $true
  $color = [Windows.Media.Color]::FromArgb($opacity, 0,0,0)
  $window.Background = [Windows.Media.SolidColorBrush]::new($color)
  $window.Opacity = 0.8
  $window.Left = $window.Top = 0
  $window.WindowState = 'Maximized'
  $window.Topmost = $true
  $window.Content = $label
  
  # block user input
  $null = $userInput::BlockInput($true)
  $null = $userInput::ShowCursor($false)
  
  # show window and display message
  $null = $window.Dispatcher.Invoke{
    $window.Show()
    $LockSeconds..1 | ForEach-Object {
      $label.Content = ($title -f $_)
      $label.Dispatcher.Invoke([Action]{}, 'Background')
      Start-Sleep -Seconds 1
    }
    $window.Close()
  }
  
  # unblock user input
  $null = $userInput::ShowCursor($true)
  $null = $userInput::BlockInput($false)
}

@ECHO OFF

SET "audioFile=C:\Sirena.mp3"
SET "ps1File=%TEMP%\LockMe.ps1"

(
ECHO:Add-Type -AssemblyName System.Runtime.WindowsRuntime
ECHO+
ECHO:$audioFile = "%audioFile%"
ECHO+
ECHO:$MediaPlayer = [Windows.Media.Playback.MediaPlayer, Windows.Media, ContentType = WindowsRuntime]::New^(^)
ECHO:$MediaPlayer.IsLoopingEnabled = $true
ECHO:$MediaPlayer.Source = [Windows.Media.Core.MediaSource]::CreateFromUri^($audioFile^)
ECHO:$MediaPlayer.Play^(^)
ECHO+
ECHO:Invoke-Command {rundll32.exe user32.dll, LockWorkStation}
)>"%ps1File%"

("PowerShell.exe" -NoExit -Command "if((Get-ExecutionPolicy ) -ne 'AllSigned') { Set-ExecutionPolicy -Scope Process Bypass }; & '%ps1File%'") && (
    Exit /B 0
) || (
    Exit /B 1
)

@ECHO OFF

SET "audioFile=C:\Sirena.mp3"
SET "ps1File=%TEMP%\LockMe.ps1"

(
ECHO:Function Lock-Screen
ECHO:{
ECHO:  [CmdletBinding^(^)]
ECHO:  param
ECHO:  ^(
ECHO:    # number of seconds to lock
ECHO:    [int]
ECHO:    $LockSeconds = 10,
ECHO+
ECHO:    # message shown. Use {0} to insert remaining seconds
ECHO:    # do not use {0} for a static message
ECHO:    [string]
ECHO:    $Title = 'wait for {0} more seconds...',
ECHO:    
ECHO:    # dim screen
ECHO:    [Switch]
ECHO:    $DimScreen
ECHO:  ^)
ECHO+
ECHO:  # when run without administrator privileges, the keyboard will not be blocked!
ECHO+
ECHO:  # get access to API functions that block user input
ECHO:  # blocking of keyboard input requires admin privileges
ECHO:  $code = @'
ECHO:    [DllImport^("user32.dll"^)]
ECHO:    public static extern int ShowCursor^(bool bShow^);
ECHO+
ECHO:    [DllImport^("user32.dll"^)]
ECHO:    public static extern bool BlockInput^(bool fBlockIt^);
ECHO:'@
ECHO+
ECHO:  $userInput = Add-Type -MemberDefinition $code -Name Blocker -Namespace UserInput -PassThru
ECHO+
ECHO:  # get access to UI functionality
ECHO:  Add-Type -AssemblyName PresentationFramework
ECHO:  Add-Type -AssemblyName PresentationCore
ECHO:  
ECHO:  # set window opacity
ECHO:  $opacity = 1
ECHO:  if ^($DimScreen^) { $opacity = 200 }
ECHO:  
ECHO:  # create a message label
ECHO:  $label = New-Object -TypeName Windows.Controls.Label
ECHO:  $label.FontSize = 60
ECHO:  $label.FontFamily = 'Consolas'
ECHO:  $label.FontWeight = 'Bold'
ECHO:  $label.Background = 'Transparent'
ECHO:  $label.Foreground = 'Blue'
ECHO:  $label.VerticalAlignment = 'Center'
ECHO:  $label.HorizontalAlignment = 'Center'
ECHO:  
ECHO:  
ECHO:  # create a window
ECHO:  $window = New-Object -TypeName Windows.Window
ECHO:  $window.WindowStyle = 'None'
ECHO:  $window.AllowsTransparency = $true
ECHO:  $color = [Windows.Media.Color]::FromArgb^($opacity, 0,0,0^)
ECHO:  $window.Background = [Windows.Media.SolidColorBrush]::new^($color^)
ECHO:  $window.Opacity = 0.8
ECHO:  $window.Left = $window.Top = 0
ECHO:  $window.WindowState = 'Maximized'
ECHO:  $window.Topmost = $true
ECHO:  $window.Content = $label
ECHO:  
ECHO:  # block user input
ECHO:  $null = $userInput::BlockInput^($true^)
ECHO:  $null = $userInput::ShowCursor^($false^)
ECHO:  
ECHO:  # show window and display message
ECHO:  $null = $window.Dispatcher.Invoke{
ECHO:    $window.Show^(^)
ECHO:    $LockSeconds..1 ^| ForEach-Object {
ECHO:      $label.Content = ^($title -f $_^)
ECHO:      $label.Dispatcher.Invoke^([Action]{}, 'Background'^)
ECHO:      Start-Sleep -Seconds 1
ECHO:    }
ECHO:    $window.Close^(^)
ECHO:  }
ECHO:  
ECHO:  # unblock user input
ECHO:  $null = $userInput::ShowCursor^($true^)
ECHO:  $null = $userInput::BlockInput^($false^)
ECHO:}
ECHO+
ECHO:Add-Type -AssemblyName System.Runtime.WindowsRuntime
ECHO+
ECHO:$audioFile = "%audioFile%"
ECHO+
ECHO:$MediaPlayer = [Windows.Media.Playback.MediaPlayer, Windows.Media, ContentType = WindowsRuntime]::New^(^)
ECHO:$MediaPlayer.IsLoopingEnabled = $true
ECHO:$MediaPlayer.Source = [Windows.Media.Core.MediaSource]::CreateFromUri^($audioFile^)
ECHO:$MediaPlayer.Play^(^)
ECHO+
ECHO:Lock-Screen -LockSeconds 30 -DimScreen -Title 'La pantalla se desbloqueará en {0} segundos.'  
)>"%ps1File%"

("PowerShell.exe" -Command "if((Get-ExecutionPolicy ) -ne 'AllSigned') { Set-ExecutionPolicy -Scope Process Bypass }; & '%ps1File%'") && (
    Exit /B 0
) || (
    Exit /B 1
)