When Sammy comments in "A & P" about how "hard the world was going to be me hereafter," what do you understand?

I would also add that the magnitude of his decision finally hits Sammy when he realizes that the girls are already gone.  In that final moment he realizes what he just threw away.  It is not like he has any job opportunities knocking down his door.  Remember, Lengel gave Sammy that job as a favor to his family.  And since part of what Updike is trying to show us is the disparity between the social classes with Queenie and her friends and the store workers, part of Sammy's final realization is that he learned a hard lesson for the working class.  Also note that while Sammy is quick to criticize everyone from his co-worker, Stokesie, to the female customers, at least they all have roles and are serving purposes.  Sammy, though, is really serving no purpose other than criticizing others and being unhappy with his station in life.  Does he look back differently at his job, Stokesie, Lengel, and those customers when he is now out of work and realizes "how hard the world was going to be for me hereafter"?