I made the black screen work. I used a fancy library called tkinter to create a black screen on every monitor, and to get all the monitors I used the screeninfo library. Then I looped trough every screen and added a new window to it using that tkinter class.
After this, I created two methods that block and unblock some keys on the keyboard, specifically the win key, the alt key and the control key so that you can’t exit the screen and cheat your way through the break