They seem to have this idea that keys are one-time-use items that automatically unlock whatever locked door you happened to encounter most recently.
Then again, horror game developers also think flashlights drain their batteries in 3 minutes and that otherwise mundane locations are littered with spare batteries, so I don't know what reality they live in.
Comments
"Well, you see, it wasn’t always a police station. It used to be a museum!"
"... What madman would arrange a MUSEUM like this?"