I have an automatic door closer on the room my snake is in. It's not one of those big bolt on types. It's just an adjustable spring loaded type that you just replace one of your door hinge pins with.
The reason I'm posting this is to help people that have snakes that escape from time to time (Like Mine !!!) keep it contained. Whats so great about is if it does escape you know its in the room somewhere... The best part about it is peace of mind, yeah your snake may be out of its cage but you know its somewhere in the room.
I'll try to post a link from ebay. someone with a little more skill can upload the pick if they want to..... http://www.ebay.com/itm/ACE-ADJUSTAB...#ht_1160wt_754

Anyways I bought 2 for like 10 dollars quite a while back and its been one of the best 10 dollars i have ever spent.
One more thing, mine is not strong enough to make the door latch but its closed enough to where the snake can't get out of the room...