Deliver pizza's or busboy/server at a restaurant. These two are going to be the highest earning jobs for your age. I worked as a "lot tech" in between jobs, it was ok. But my title was "service assistant", there was a seperate dept for washing cars, all i had to do was valet, clean,but I ended up pretty much sat at the customer service desk answering calls, making appointments, helping customer's, filling out RO's etc... Bascially i was an EXTREMELY low paid service advisor. Service advisor's can make really good money salary + commission i've heard many SA's making 70k+. Before I got my current job at the bank I was looking for advisor jobs.