One of my cats used to jump up, grab onto the doorknob (or rather kind of circle around it with his paws/front legs) and then kind of slam his back feet against the door trying to force it open, all while screaming. It never worked but it made a lot of noise, especially in the middle of the night.
Now I have to give the fucker a treat before I go to the bathroom (if I know it’ll be more than a few minutes) and can’t have the bathroom door closed while showering. He barely tolerates the closet doors being closed. He’s too old to brute-force doors open now but he’ll still scream bloody murder if someone dares to close a door he wants opened.
I love the doofus to death, but I am never letting another Tonkinese in this house. Ever.