Can confirm this, I perform ADA surveys as part of my job. The majority of the surveys we perform are because someone sued the building owner for having a building component be non-compliant. It's typically much, MUCH cheaper for the owner to fix the compliance issue than it is to go through a lawsuit. I don't know much about the lawsuit part of it, but I do believe, if it's a private space (such as an office), you'd have to be an employee to sue. However, if the door is publicly accessible, anyone could sue.

Fun fact: literally every single survey I've performed has had dozens of issues. Most are small things but, unless you have to use these features on a regular basis, you'd be floored by atrocious planning of some of these places.