Quote Originally Posted by Prognathodon View Post
A lock keeps a snake from working a sliding door open as they explore, squishing themselves between the door and frame. Consider it a door latch, aka inexpensive peace of mind, and keep the key on top of the cage. If you have kids (or childish adults) in the house or visiting, a lock can also help keep unauthorized hands off.

For this reason exactly. Nobody in my family really even goes close to my snake enclosure. My snake is small, and isn't able to move the glass doors on her own. BUT.... what if my son has friends over when I'm not there, and they get curious. What if while cleaning or moving stuff around, I bump it and slide the glass open a little? In my house, there really is no chance of that cage being opened by anyone other than me, but for $20, I have the peace of mind knowing that nobody can get into that cage and no snake can get out without my knowledge.

Just cheap piece of mind.