Climbing the Stairs

Celeste has decided she likes climbing the stairs and makes a bee line for them.  She is a really good climber.  She isn't so good at staying focused and constantly turns around to see what's behind her - which isn't good for her safety.  We are working on a solution to keep her off of them.  The door at the bottom takes her about 2 seconds to open, so we are working on a way to lock the door, that is easy for the other kids to access.