The Junction Box Key is an Inventory Item that can be used in the game.
The Junction Box Key is a small simple metal key with a ring at one end and a bent hook at the other end.
The Junction Box Key can be found hanging on a hook by the door that is to the right of the furnace.
Josef can simply take the Junction Box Key off the hook.
To unlock the junction box to gain access to the Junction Box Puzzle. Josef can use the Junction Box Key to unlock the junction box containing the Junction Box Puzzle.