It's the door inside the gas station
Yeah, it's outside. I didn't see the key, just ran everywhere. You can go around the fence above, if you go left first. The fence is broken and you can go around to then go right. In the right corner is the key.
The key is upstairs in the hallway with two glass boxes. Just push the right one to the left and you got the key.
I did, that's why I wrote it 馃槀
The bloody key is in the courtyard up north behind the fence and all to the right
