I'm going to go into a stall if other people are waiting when those other people didn't check to see if the door was unlocked.
Who are you doing this for, yourself or others?
It's for those who haven't checked the door.
I see that may be an interesting experiment, but there's really no point in doing something so disruptive. A public bathroom is a get in and get out experience, and you are only prolonging the stress by doing this weird thing.
It's about proving a point that people should check the stall doors instead of waiting around.
That could annoy lots of people and waste lots of time. I doubt you'd want others doing that too.