Turn off the display and lock the workstation using the Windows API via PowerShell

Lock_and_power_off_display.ps1

# filename: Lock_and_power_off_display.ps1
#
# This script turns off the display and locks the workstation using the Windows API.
#
# Warning: This script will turn off the display and lock the workstation indefinitely until stopped manually.
# 
# Import the necessary libraries for interacting with the Windows API
Add-Type @"
using System;
using System.Runtime.InteropServices;
public class Screen {
    [DllImport("user32.dll")] public static extern void LockWorkStation();
    [DllImport("user32.dll")] public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);
    public const int HWND_BROADCAST = 0xFFFF;
    public const int WM_SYSCOMMAND = 0x0112;
    public const int SC_MONITORPOWER = 0xF170;
    public static void PowerOff() {
        SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
    }
}
"@

# Start a background job with a specific name
Start-Job -Name "LockAndPowerOff" -ScriptBlock {
    # Import the necessary libraries for interacting with the Windows API
    Add-Type @"
    using System;
    using System.Runtime.InteropServices;
    public class Screen {
        [DllImport("user32.dll")] public static extern void LockWorkStation();
        [DllImport("user32.dll")] public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);
        public const int HWND_BROADCAST = 0xFFFF;
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MONITORPOWER = 0xF170;
        public static void PowerOff() {
            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
        }
    }
"@
    # Turn off the display
    [Screen]::PowerOff()
    # Wait for 2 seconds
    Start-Sleep -Seconds 2
    # Lock the workstation
    [Screen]::LockWorkStation()
} | Out-Null

# Display a message to indicate that the display is turned off and the workstation is locked
Write-Host "Display turned off and workstation locked. Press CTRL+C to stop."

try {
    # Keep the script running indefinitely
    while ($true) {
        Start-Sleep -Seconds 1
    }
} catch {
    # If an exception occurs, stop the background job and exit the script
    Get-Job -Name "LockAndPowerOff" | Stop-Job -Force
    Write-Host "Job 'LockAndPowerOff' stopped and script exited."
}