New York City retail workers told the Post that they are fed up with the brazen shoplifters who hit their stores and are scared to step in — as complaints for store thefts soar to record levels. ‘You never know if these guys have knives,’ Nike security guard says ... A 30-year-old security guard at a Manhattan Nike store told The Post Friday that at least one person per day tries to make off with some goods. ... ‘As bad as Dinkins’ era,’ ... Shoplifting continues to run unchecked in NYC and stores like the Modern State party supply store...