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To lock a door without a key, start by finding a sturdy chair that isn't a folding chair. Then, close the door you want to lock so you're standing on the side that it opens into. When you're ready, wedge the top of the chair underneath the doorknob. Try to get the chair as close to the door as possible, which will apply pressure to the door so it can't be opened from the outside. To learn how to lock a door from the inside or outside using a key, keep reading!