Oh my mistake.
The key is actually in the storeroom on the first floor in the past. Have you tried talking to that guard blocking the entrance to the store room?
Ah, that did it. I forgot to ask about it afterwards, it seems. Thanks!
I also want to say, I've been having a blast playing through so far.
Glad that I could be of help. Feel free fo ask if any other questions should arise!
And thanks, happy to hear that you are enjoying your time with it^^
