break the key in half and eat the pieces
Go back.
go through door "door" and scream "I DRANK 'COFY' WHICH WAS REALLY ACID LOL IM FUNNY RITE"
ctrl k
search behind smiley face for something to smash the key with
Use a wrench to turn the wall's collision off and walk through
Nix throws a wrench pulled out of hammerspace at the wall. It gets stuck in there and can't be pulled out.
Screech "I VILL SIEZE ZE MEANZ OV MASS PRODUKSHION FOR MOTHER ROSHYA!" As you crawl through the hole