Hello everyone.
This might be a dumb question, but I cannot figure out how to open a door with the correct key. I've pick-pocketed the S.Hills Bank key, but cannot get into the back room. I've tried to place the key into the hand-slot in the inventory, but the game doesnt let me. Putting the key into the quick use box leads to my character hurling it at the door instead of using it. Ive tried to simply walk through the door by clicking behind it to no avail. The manual only mentions lockpicks, as far as I know. So any help would be appreciated!

If you have the right key, the door will open as you attempt to pass through. It's as simple as that. If the door doesn't open, then it's not the right key.

Alternatives to bashing the door down include picking the lock (requires points in the skill, plus lockpicks) or the Unlocking Cantrip spell (as loud as bashing it, plus magically held doors require you to have a high enough MA to overcome that).

Also, keys will quickly accumulate. Buy a key ring at your first opportunity, from any general store. All keys will then accumulate to the ring, saving space in your inventory.

Thank you, much appreciated. It seems like one of the doors was bugged and refused to open at night time, even with the right key in my inventory.