Jakobs Manor Locked Door

In the room before the theater, there are a couple of slot machines. In the other far corner, next to a chair, is a door with boards over it. When you approach it, it says “Locked”. This isn’t related to the hidden room in the library, so does anyone know what’s up with it?


I’ve been wondering that my self. Everything I’ve found refers to skull puzzle door. If you find anything let me know as well.