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You need to find another way out of the room since the windows is shut.
Attack the broom with force 4. It’ll tip over and hook into the ring of the vent. But it won’t open. Use force 3 on the toy car on top of the cabinet to pull it back. Use force 3 on the right keyhole. You’re now inside the closet.
Use force 3 to attack the remote. The car will drive against the books, making one to tip over and fall onto the broom. Then the vent will be open. Use force 3 again to attack the keyhole again and you’re out of the closet. Use force 3 to attack the vent and you’re free again.
Game source: A copy of the game was found here  on the internet.