The steel key is a hidden item. An inmate hints at where it is. It opens a steel safe in the warden's office by dragging it onto it. The snacks can be bought at the commissary and given to the twins by dragging the items onto them. The only drag effect I didn't code in was the lockpick to open the warden's office bc it was conflicting with the patrol effects. Having it in your inventory unlocks the door.