I used live in place with public toilet with the door like this. My wife was always nervous and asked me to stay in front to look if it works. But then a girl entered the one next door and try to lock/unlock several times, obviously not knowing what happens, and end up peeing with the door unlock and the glass fully transparent. I had to go away to be polite but then my wife was made that I left my guard. Then I had to explain and she was balanced between both options. I would have been wrong anyway.