It is possible to make keys to the old mortise type locks, but it is costly. There is also replacement hardware available, but they usually require more work to get them to fit the door, than is worth the effort. Most doors with old mortise type hardware already have a deadbolt installed above them. We typically recommend disassembling the chassis and removing the parts that can cause it to “accidentally” lock. This way you can keep the hardware for the old look and feel, without worrying about it locking you out. If there is a modern deadbolt above it, use that to secure the door. If there is no deadbolt, we can install these for you.