Z wave locks use a specific technology called “beaming” which most other battery operated devices don’t use. For that reason, they tend to work best when there is a repeater which supports beaming quite close to the lock. This is true even for locks which are in the same room with the hub. So it’s not about range exactly, it’s more about having a device nearby that can hold the beaming messages for the lock. See the FAQ (this is a clickable link)