By the time the Pilsen Food Pantry opened on a recent morning, Ulysses Moreno had been there for two hours — with a line of people behind him that snaked around the corner. “This is a lifeline for me,” said Mr. Moreno, 39. He had lost his construction job a few days earlier, and with three teenagers at home, he wanted to make sure he could stock up. “Our food budget doesn’t stretch as far as it used to.” A few miles away, on Chicago’s glitzy Magnificent Mile, luxury hotels are bustling. Jewelry stores and designer boutiques do brisk business....