I know this does not have anything to do with the topic at hand but how would they get out if the restraints were locked?
There is a physical lever that you have to push and it releases the retrains, its on every car. It's also just about standard on any roller coaster train. Some old ones(Cedar Creek Mine Ride) use this leaver instead of computers to lock and unlock the riders still to this day.
I see thanks I know they have those I just didn't even cross my mind.