NT4 Shortcut to Lock Server

I’m simply trying to create a shortcut for a one button lock of our NT4 SP6a server. I’ve tried the “%windir%\System32\rundll32.exe user32.dll,LockWorkStation” but that gives me an error “Error in user32.dll Missing entry LockWorkStation”. I did find that there is an entry called LockWindowStation in the dll. It didn’t give an error – it didn’t do anything. Anyone know what works or have alternate solutions for a one click server lock?