I have a quest at Sopie's potion shop, i went in, move around a little after talking to Sophie and i hear some noise. I went out to check, cant find the source and when i go back into the shop, it's all pitch black.

i can move the character and exit the shop but cant see anything. So i went ahead and worked at the other shops and also worked the tavern's night shift. Now i'm stuck with nothing to pass time and everyone telling me to talk to them later.

When you hear the noise, just approach the backdoor and that should trigger the scene.

You shouldn't be able to leave whilst that backdoor is triggered though. I'll see if I can reproduce that and add a fix to the next major patch.