I don't do anything to the doors before landing. Not that they have a lock anyway, but if they did why would I use it when in flight? Who is going to try to get in or out?
That's part of the pre take off check, not pre landing. Pre landing check is correct configuration, not everything working.... So it should be pretty straightforward and tailored to the aircraft. As in, no point checking prop pitch or undercarriage if they are fixed, but it's probably a good idea to confirm the altimeter setting and that you are using a tank with some fuel in, and on the right radio frequency. Invent your own memnonic, why don't you?
Access for rescue service? Hmmm. Not applicable at our aero club. Try not to crash.