A fun thing about my classroom is that the heat of the sun wreaks havoc on my door every afternoon. It gets really hot, and the metal expands, making it so that it is almost impossible for me to unlock the door. I have to walk around the building and get in from a door that doesn't have hot sun. Yesterday, amazingly, the lock was so hot that I almost couldn't even open the door from the inside. The SUN can lock me into my classroom!