Ugh, I'm getting secondhand anxiety just reading this. I can imagine in a few areas where this could go completely wrong and become needlessly escalated:
a) A deaf passenger goes in, gets blocked in. S/he cannot communicate or hear. Panic ensues, the passenger tries to break out. Police is called upon arrival.
b) A claustrophobic passenger gets blocked in. Panic gets to a point where s/he passes out.
c) A blind passenger gets blocked in, thinks s/he opened the wrong door, gets confused and flails around.
In no way is this right, at all.