I find it really sad that Saturday jobs seem to be a thing of the past. I did various jobs from age about 14, as so did most of my friends.
From 16 I worked in a fashion shop on a Saturday, delivered local papers once a week, did a rota of Sunday work in a sweet shop, filled in a cleaning job for cleaners on holiday, where all the ladies were picked up in a van and off we went. Actually I learned from that job that the cleaner always gets first blame, so not to touch things left on desks. Over many years of office jobs later, if I hear anyone complaining about a cleaner just cleaning around their things, I try to stick up for them.
At college, I signed on for temp work and worked in various places over the summer break. I was in the office, but in a factory environment I chatted to women who’d worked their lives there on the production lines.
All these things were fantastic experience at such a young age. I think it was more the interaction with different people, environments, industry types, customers, the public, etc that was the most valuable, not the typing invoices, or unwrapping and hanging clothes deliveries in the back room.