Green Club Key How to Find?
Thankfully there isn’t much of a gap between attaining the red diamond key and the green club key. That said, you are going to need to grab the crank found in the jail cells on a table next to where the thing happens (you’ll know when it does).
Once you’ve got the crank you’re safe to make your way back up to the main hall in the police station. On the second floor, just north of the art room, is a set of shutters that block your way. Crank that just like Soulja Boy showed you, and you’ll be able to pass.
From here it’s just a case of following the stairs, finding the east storage room, then passing through the room to access the balcony area. You’ll come across some metal ladders. Head down them. When you land there should be a water pump lever to your right, and to the west, a set of metal stairs leading down. Follow the stairs down and you’ll see a door. Head through and inside, on a whiteboard with an amusing message, is the green club key.