[EDIT: All that is wrong, because there is no check, and the doors always open]
Every place I've ever seen one of those doors, when you can't return, you can always go forward, when there is some check, and you may not be able to go forward, you can always return.
I guess, the police would be able to legally create a silo that may detain you, but nobody else can (at least on most democratic countries, I'm not sure about the US specifically).
Every place I've ever seen one of those doors, when you can't return, you can always go forward, when there is some check, and you may not be able to go forward, you can always return.
I guess, the police would be able to legally create a silo that may detain you, but nobody else can (at least on most democratic countries, I'm not sure about the US specifically).