Automatic logout with pyautogui?

I'm trying to automate logoff on a Windows system using Python. It should only logout like with win+l and not logoff like with shutdown -l.

I tried using pyautogui to press win+l, but for some reason it doesn't work. The shutdown /L and shutdown -l commands don't work either, as they kill the current user's process and close all processes, like a reboot would.

Thanks for any help!