it's been a long time since I played this so I might be wrong, but as I recall if you hover your pointer at the bottom of the screen it should "highlight" a clickable bar, it's not visible without moving your pointer over it (other screens might have it on the left or right side edge) and yet others have doors that might not but jump out as obvious (the store for example).
No, they fucked up in a quest. That's what they did.
Uploaded a picture. There is nothing there..
What were you doing just before this? Checking on Clara and Becca in the closet (or on your way to get the key to do so, or coming back from getting the key) and you took a wrong turn?
See:
31,350
Also, if you haven't already done so, build a save regimen using 3-8 save slots in the first page of the saves (at least - I mean, you have like 180 save slots available -- could almost do a new one each day) rotating through so that you have 2-7 older saves you can go to if this game that is in development bugs out, you do something you should, you do something the developer poorly didn't plan for, etc. Best of luck.