He's tired or bored or both.
Good answers, Gerald, Bertold, and especially Daniel. I think many, if not most, factory workers (and others) are Sisyphus-like. Every day, the same ol', same ol'. It's a living, but you're not getting anywhere. You feel frustrated, perhaps angry, resigned to your position in life.
Wikipedia explains the Sisyphus mythology in grand detail. You learn something every day!
Why don't I just stop? What's he gunna do, kill me?