For instance I got paid part-time to do research as an undergraduate at New Mexico Tech. I know at Cornell this is this service called "TakeNote" which pays graduate students to take notes for undergraduate classes. I am sure there are other things at other unis. Note that people around Unis have a large need for services involving (natural) languages that are not their native language so if you know language L you may be helpful in many ways to people who don't know L.
One of the best "unskilled" jobs you can get is doing high-intensity cleaning projects at somebody's house. This is not being a regular maid but rather busting ass for four hours to do the cleaning that a homeowner would take twelve hours to do so that they see upwards of $25 an hour in value if not more.