There's all kinds of items in the basement for you to use. The goal is to break the door. You have to interact with the door, first.
This is the low-spoiler guide for "Escaping the basement" puzzle in Gibbous - A Cthulhu Adventure. 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.