They simply do the same task over and over again without knowing what the final product may look like.
Alienation of Self
He is upset about the poor conditions of the factory that he can't control.
False Conciousness
Their boss is congratulating the one on the right for his great performance by giving him a promotion. While the one on the right is upset about trying his hardest and getting nothing in return.
Class Conciousness
He is questioning why he does his job anymore, since he doesn't enjoy it like he used to.