Locking the storm shelter is not for me..My neighbors all have a big welcome when the clouds start getting nasty. I for one would hate to tell someone they can't use my shelter in order to maybe save their life.Storm sellers are good and bad...
The good is if you need it, you have it.
The bad, you find out just how many "friends" you suddenly have cause everyone and their dog thinks they can use yours. Even for storage without your knowledge, but thats another thread, oh and keep it locked for the times you are not around.