this reminds me of a childhood incident. when my sister and I were 8 and 6 in about 1979/80 we were on holiday in Las Vegas with parents and big family group. Massive hotel/casino complex. we were left upstairs in the hotel room asleep while the adults were downstairs at the casino and of course woke up. my sister was crying so I decided to take her to try and find our parents. when we left the room, in our nighties, the door locked behind us, of course, and we were locked out in the corridor.
she eventually stopped crying and we started wondering around. we found the emergency stairs and I remember we had a whale of a time running up and down corridors on different floors, playing with the ice machines. we eventually made it down to a balcony over the casino and had more fun looking at the adults, but couldn't see our parents. We eventually went back to our floor (remembered the number, luckily), ran around some more, ate some more ice, then found the door at the other end which led to some metal fire escape stairs down the outside of the building (we were on 18th floor). we decided to go down them but, luckily, I think we had set off an alarm, and a nice cleaning lady with her trolley came out and grabbed us back in. she didn't speak English but was very friendly. we found the locked room and she let us back in with her master key. To this day, my mother refuses to believe this happened.
I think this Memory has put me off leaving young kids in hotel rooms alone. We were fine of course but could have got out of the Hotel or met someone less friendly. I do always wonder as well how many people in a hotel have master keys to the rooms and how that could be abused.
Different in a much smaller hotel.i guess or with baby listening etc.