I only have one smart lock, which works perfectly, and it is called "FRONT DOOR" in HomeKit.
When I ask Siri about my FRONT DOOR she responds that she cannot find it.
When I ask Siri about the status of my DOOR, she responds with "The FRONT DOOR is locked/unlocked".
I'll then say 'Alright Siri you literally just used the phrase "FRONT DOOR" five seconds ago and the text transcript on the screen says "FRONT DOOR" hey Siri is my FRONT DOOR locked'
Siri: WTF are you talking about? You don't have a FRONT DOOR.
"Hey Siri is my door locked"
Siri: Your FRONT DOOR is locked.
Google and Alexa handle things flawlessly.