I think the somewhat better ones use blanks that are in theory only sold to locksmiths (not to your typical hardware store/kiosk), but that's unlikely to matter all that much. These days you can get keys made from a photo or two, or you can just spend some time watching Deviant Ollam's videos and likely have several other options for opening doors.

Popping the pins is probably not a great approach for daily use though.

There are some ones that use mechanical features, rollers usually, that require access to either a good machine shop or OEM blanks.

Or a bent screwdriver and a spring steel hook

Yeah, back in the day you'd have to go to a crappier store and (over)pay for the new key with cash. Putting a piece of strong tape over the words and having a decent story didn't hurt either.

Nowadays you can just use the kiosks in grocery stores though.