Storm Chasers Escape!

It is a dark and stormy day. The storm chasers are used to being in this kind of weather, but as they chase the storm they know this one is different. Suddenly, the storm turns for the worse and they know they need to take cover. They park their van next to an old barn and run inside. Right away they realize it will be too dangerous in the barn and they need to find a safer place to get out of the storm. They see a cellar door and know this is a better place to go. They make a run for the cellar, but the door is locked! The only way to safety now is to figure out how to unlock the door. Can you help them make it to safety?