since we're talking about this, I won't add anything useful to this thread, but:
in Madrid, there's a station where you can "get stuck" in between two sets of these
there's a corridor with a line of these to get outside of the Metro, and in front, a line of these to get in the commuter rail, no exit or any other way to go.
I like to think of this as a "real life game over". like, yeah, buy a single-trip ticket, leave all your money and credit cards at home, cross one of those barriers, and you're now stuck there (especially since real life has autosave enabled)