Most people who work those "boring" jobs have found ways to make it enjoyable. They still pick up their paycheck, but they have found some way to enjoy it. They talk the the person at the next station. They challenge themselves to how fast they can do thing (often the safety officer needs to stop them from getting better, which is itself a challenge)

Assembly line workers invariably like assembling things. Even if they don't start liking it, they usually change their personas.

The one job I can think of where the people really don't like is telemarketing. But it's a rare exception, and people tend to not stay on it.