Our 4 year old daughter will be taking her first cruise with us on the Oasis of the Seas this fall. We have a D1 Balcony stateroom on deck 12, and we are worried about her trying to go out on the balcony by herself in the morning while we may still be sleeping. I know the balcony doors have a large lever that locks the doors, but she could probably pull that down and open the door. Anybody know of any locking device we could use to help secure the door in case she tries to open the balcony doors? Thanks!