Personally, I hate being in a tiny space with a door that locked itself, and you don't know if the other door will open. I hate how you can't open fire doors from inside them.
You see, we were moving furniture around inside an apartment, and we used the fire escape for ten minutes, to put something, to have room to move the rest around. I went in to take it out (remember, I was about 10 at this point), and the door slammed. I try to open it.... and then I begin to cry. I bang on the door, but it's pretty soundproof. And I'm not sure how long the air will last. I take a chance and run down the stairs, and thank goodness, all the doors on the way down to the bottom floor open. I'm surprised the front desk opened the door for a little shoe-less tear-stained boy. I asked him to do the lift and went back upstairs. That's all.