opening door puzzles

[Rownbear]

So I am running out of ideas to open doors, or ideas to advance to the exit, and wanted to ask you guys if you had any creative ideas.

I've got key on door (obv)
sledge to destroy door
secret passage around door
connect pipes to get the machinery to work to open the door
pull lever/button to open door
make an acid to destroy padlock
fix hole in the ground to advance to door

So any suggestions?

[bartimeus]

Why don't you make a door which open only when your sanity is low?
I mean, there's an entity which become visible only when you're low on sanity, and moving or using that entity can open the door with a script or something. As an exemple, It forces the player to get close to a monster.