Locks and Keys

Locks and keys are mostly self explanatory. The locks will be chained to the doors, so their art needs to be drawn with that in mind.
Dimensions
Width: 1 tile, Height: 2 tiles (Lock) [the height is for the chain to cover the door]
Width: 1 tile, Height: 1 tile (Key)
Mechanics
This is an alternative to having a button to open a door.
Chucky can suck up keys with his trunk
Dexter can pick up a key
Only Dexter can use a key
Sprites
Lock and Chain for vertical doors (chain will cover the door)
Lock and Chain for trap door (chain will cover the door)
Key