If clocks were not on time, a clock winder would reset them
These workers had a very important task on their hands. Clock winders mainly worked setting the time straight in big clocks, like those on city hall buildings and clock towers, as well as maintaining that their huge mechanisms worked properly. Honestly, it is very interesting to learn exactly how they did it.
A clock winder had to turn a handle about 160 times to fully wind up a large clock, and this took about 10 minutes. Nowadays, most clocks are electric, or they work with electric winders. Still, some places prefer to keep it old school, and they work with classic human clock winders anyways.