1) Can we break down the locked door with magic or explosive?
Something that I wish would be addressed as it trivializes lockpicking (which is part of the reason of making weapons take so much durability damage on doors/containers).
Yes, this has also been bothering me a lot! Maybe increase drastically the doors/chests resistances against magic? I mean, it does not seem logical that a door or a chest can be poisoned or frozen. At least in real life (yes, I know games use phantasy setting and are not supposed to be mirrors of reality) a chest does not take any damage if you spill poison over it or you try to freeze it (how are you supposed to freeze a solid body anyway?). The only factor which can really damage a wooden chest or door is fire. But I think, there is a workaround about it: fire does not damage just the chest but also all the stuff inside it - so if you burn a chest, so you should not get any loot from it.