My first job involved selling newspaper subscriptions door to door. I was 17 and just out of high school.
Next few jobs were pretty tame- working as a cashier and floor associate and retail stores.
First jobs related directly to my chosen undergraduate major and first masters were not good experiences thanks to bosses from hades.
In the middle of those two I worked for the Census and liked it a lot.
I substitute taught just before and during library school- and would not trade the experience I gained for anything in the whole wide universe.
I am still in the same company where I got my first librarian job- only now I am full time. I have been working with them for over 4 years now