Our library still uses those old Netgear routers from like 2015, so I'm not surprised. I get what @the_john is saying about helping a neighbor, but the trick is to not let it become a regular thing. You fix the router once, cool, but if they call you every Tuesday, you have to be ready to say the magic word, "no." It's the difference between a good deed and a free help desk gig.
Oh man, I see that differently. Sometimes fixing a simple issue is just being a good neighbor, not getting stuck with a job. I'd take it as a chance to help out, not a problem.