Although the OP mentioned T5, I'm nearly positive that he means T1. I fly evening flights at O'Hare every single week and I have been met with an unpleasant surprise when I try to eat dinner after 8:00 p.m. Tortas Frontera is almost always closed by 7:45. The only restaurants that are open after 8:00 p.m. are McDonald's and Tuscany. No shops, even Hudson News, are open after 8.