I’ve pretty much decided that 20-25 ft is the practical limit for even Z-wave Plus. I have switches about 30ft from each other in a clear line of sight that were flakey until I put a device between them.
Maybe find a spot closer to the lock for a Z-wave outlet?
The beaming repeater for the lock needs to be within “whisper distance“ which is typically 3 m. It’s a security thing.
One of my beaming switches is actually right next to the door with the lock. Then 9 or so feet from that, two more. Then the hub is maybe about 12 ft.