I did several times in high school (in some states the age limit is 18, others 16) and it paid $9 or $10 an hour, which was better than any other jobs I had as a high school student. Bilingual clerks are especially needed in many areas and you can work in precincts that aren’t your own.
Hours are usually long–if the polling place you’re working is open 7-7, you’ll work 5 or 6-9, longer if you’ve still got a line when the poll closes. You’ll also have to go to a paid training that’s a few hours long several weeks beforehand. If you’re an “election judge” (the person in charge of that particular polling place), there are extra responsibilities and your day will be extra extra long because you aren’t done until the ballots reach whatever central place is counting/storing them.
You’ll want to make sure that you vote ahead of time because it can be hard to get away the day of. Dress in layers since you could be in freezing AC or outside in the sun monitoring the line or back and forth all day. Bring snacks and a book or something to do in case it’s slow (I’ve never worked a November election, but other elections had a lot of downtime combined with a few rush periods). If you’re a person who gets uncomfortable in certain types of chairs, bring your own chair or cushion.
The job itself is like a combination of customer service and rigidly following rules/procedures. There’s a procedure for everything, many of them are a pain, and the vast majority of people walking in don’t know anything about the process aside from filling out the ballot. You’ll have to explain the same thing over and over, but most people are nice and follow instructions. You may have to walk someone through filling out a provisional ballot during a rush (which takes forever) or remind people campaigning outside to stay the proper distance away. If you’re in a place with voter id laws, you’ll have to turn people away and if you’re in a place without, some people will insist on showing you photo id anyway.
I enjoyed being an elections clerk and encourage teens I know to do it because I think it’s a great way to really see what the voting process looks like, what all is actually on a ballot, and how few people actually vote.