Except if there is a fire and you realise it's stuck. A normal lock can be kicked in if not opened with master key, but that contraption sounds hard to break in to.
The bench lifting is part of the system - you can't leave rubbish or water on the bench.
You could solve a safety access issue by having the bench corner removed and replaced with a breakable component; but I'd speculate the materials are such the hinges already serve that purpose and changing the corners would lead to a lot of accidental breakage.
I'd worry about someone being ill while sat/leaning-on/collapsed on the bench though meaning you cant rotate it. I guess this is an issue for any door where a body could block it being opened? At the least in a changing room cubicle these are usually open at the top so someone could climb over in an emergency.