As a kid in the summer holidays I used to pick oats out of a wheat field by hand 12 hours a day for 57p an hour!
Stacking bales of wet bean straw by hand was tough on your skin, but not as hard as stacking wet hay bales! Kept me fit though 😉
Cleaning supermarket floors at 4am in the morning.
Never thought of them as "lowly" at the time, but back then I did used to get some flack from my mates who were all doing bigger better things.
Only one Job I have ever regreted doing was after recently qualifying as a Photographer. Working for a nasty gutter newspaper, nasty, nasty, nasty work back then( 20 years ago) I hated everything about that job!