Generally if the lock is horizontal its supposed to mean locked. You can flip this on most common locks, but then its backwards. It makes sense from a visual perspective to have vertical unlock, horizontal lock.
I think it is! The metal block slides in that direction so it's rather intuitive. One lock I know that works the other way is my flat lock, and it's just wrong model installed incorrectly; it's upside down
if it still locks the door it's fine then! Water valves need to be standardised as sometimes you need to know water's not flowing, especially if it's an emergancy, but a door lock? just check if it's closed man
I was about to say that it wouldn't matter which way was "locked", because his friend could easily unlock it and see what's on the other side of that door... like, they'd need to use a keylock to keep their friend from having easy access and seeing what's behind that door
Took me several attempts to realize they were locking themselves in the room; for whatever relations to be interpreted. I never claimed to be a smart man