Hello, I have a problem. Could you help?
My door is locked, then player use the lever and it opens. But after this the door doesn't lock anymore, and he can open it anytime he wants. I want the door open and close only with a lever. How to solve this problem?

When you make the lever a parent activator to the door, you can check 'Parent Activate Only' which makes it so normal activation of the door is not possible, and the lever must be used.

It works, thank you so much.