When we got our EB the salesman said "You have to lock and unlock it from the inside only" so we thought our broken lock mechanism was a "feature." I kept puzzling over why there was a key for it and a keyhole on the outside if it wasn't meant to work. And it didn't work, just turned freely, with no effect.
When we took it in for other warranty work we questioned the purpose of the keyhole and told him what the salesman had told us, and the service manager was all "No, no no. That should definitely lock and unlock from the outside." And now it does. :-)