Today you most often see magnetic key cards in hotels because they can be easily set to deny access after checkout time and there is little worry about lost keys.

Other terms for a pass key are master key or skeleton key.

Back when there were five and dime stores, I remember they sold a set of four warded skeleton keys to open most interior doors in houses. Those locks had keyhole you could look through into the room. The emoji for a key is typically a warded lock key.

1 hour ago, JamesSavik said:

One of my many jobs was that of a maintenance man at a hotel. I would be called to a room to unplug a toilet or fix the phone or TV. If I ever got a different call, I don't remember it. I was much happier when I was called to an empty room because I could go in with my passkey and not have to deal with hotel guests who were usually drunk and/or surly.

No interesting tales of hot, naked men in showers?