The subject is smart locks.
You know the drill: what’s a privacy way to get it working? Is there an open standard that can be used to self host an online solution instead of relying on the manufacturer’s cloud?
Or am I restricted to offline locks that are basically just a combination lock?
Thanks in advance!
Short answer: forget about smart locks, they’re almost all trash, certainly the affordable ones.
Long answer:
The highest security locks are those like Mendeco which support diagonal cuts in the key. It’s expensive but worth it if your door needs to be secure.
Thanks! And thanks to @anon21666177, I’ll look into that.
In this case physical security is not a big issue because it’s going to be insider a building with it’s own security. So we’re talking basically remote access control in a privacy respecting way.
For that I’d just use a second key for that specific room aside from the main building key.
I used to be obsessed with door locks (and locks in general and then I was recommended by this video on Open Source Security Podcast).
Apologies for the YouTube link. I am in a hurry.
The TLDW of the video is: Nice and secure locks and keys are cool until they demolish your wall in less than a minute.
Don’t overspend on fancy locks if the walls (or windows for that matter) can’t keep out the baddies.
I’m thinking of investing in a gun or something. 
I don’t know if the point of locks are to keep firefighters out…
I agree but the tool they use to breach walls are a well-known and are actually very simple and relatively easy to build. This is one of the things to consider when spending.
They’re just IoT garbage.
Another good read: https://www.vententersearch.com/supplemental/fdny_fe.pdf