The laundry closet door is locked. But the key seems to be on the other side of the door, in the keyhole.
This is the low-spoiler guide for "Laundry closet" puzzle in The Darkside Detective - A Fumble in the Dark. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.