How can I expose a lock to Google Assistant?

I used SmartThings Classic (is this what most people use? The newer one doesn’t have Marketplace) and while I can link to my hub, I’m only seeing the Good Morning, Goodnight, etc (which I don’t want) but not my Schlage lock. What do I need to do to expose (and prevent) devices so they appear in GA?

Google will not use locks at the moment. You can get around it with a virtual switch.

So I wanted to do the same thing and accomplished it.
I created 2 Momemtary Button Tiles in the online IDE.
I use the Automation Director app to Unlock the door when one was pressed and lock when the other was.
I’m on mobile at the moment so I don’t have links, but pm me if I forget to post later and I’ll send to you.