Where is the key in Burger Pizz? I checked everywhere but there are no keys around. There are just a few weapons with which I could easily defend myself, but I can't interact with them for some reason.
Viewing post in The Night Upon Us comments
In The Men's stall you'll be able to open the door of the washroom and in one of them you'll find a opened toilet cover, inside the toilet you'll find the key.
but first you'll have to go to the kitchen's freezer to trigger a dialogue of lenny being in the freezer then you'll be able to find the key, click "E" to interact.