The guy appears to have been too mobility restricted to peal the doors- a fairly easy process the last time I did it 20-30 year ago.  Nobody then knew what the emergency buzzer signified  either. I learned that from a hospital nurse who was amazed when I jumped onto her floor from  stuck elevator. Same thing in the Gatwick Hilton in Greater London. Very likely since then  the Safety Bullies have made elevators escape proof -even for the physically able