the easiest way to resolve this is for me to find a place for the cellar key so you dont need the minotaur to open it for you
since the basement has a bell to call the minotaur anyway
maybe you could hide the back door key to the cellar so you could still keep the minotaur section.
if you're going with that then a note somewhere about the trap door be easier to access, (like in place of the back door key maybe?) since as far as i can remember the only note talking about the trap door was in the attic. altho i could be dumb and forgetting if somewhere else had one lol.