Different doors have locking mechanisms that vary from one another. Older house locks are easier to open while the newer ones are a bit tricky. However, you can use the following methods if you lock the keys in the house: 1. Use a bump key. They have crafted keys which you can use for unlocking the pin-based door lock systems. Such door lock systems are spring type and the ridges present over the keys open when pressed over the corresponding pins. Bump keys work well for home locks as they are single-sided. 2. You can use the butter knife by turning it into the makeshift door lock pick. 3. You can use multiple paperclips and turn them into a lockpick. 4. You can use a professional lock pick tool but you need to learn how to use it. 5. You can pick your door lock by using the bobby pins. However, if you have an emergency situation like a baby crying inside the home, something boiling over the stove or there is an injury then try breaking in on your own house. You can kick the door or smash any window facing outwards.