We have had 2 of these locks for over 2 years now. Our front door we have it set to auto lock after 30 secs, side door we lock manually as we go in and out of this door with groceries etc. Never have had a problem with either. Had to change the batteries on the side door since we use it more. Don't have to worry about getting keys for others that need to get in for a reason. Took a bit for us to get them installed, but once we figured it out, the second one was a lot easier. Would like to be able to tell who (which code) entered at times.