Yes. 9-5 is really more of a saying than legal truth. People who have to clock their hours usually work 8-5 with a one hour lunch, with some opting to take a half hour lunch and leave early / arrive late with manager approval.
Of course someone who has only worked salary without concern for billable time may never have experienced this. But even for salaried employees if your employment agreement says 40 hours, that does not include lunch breaks. Few employers in tech care because bean counting hours doesn't increase performance for creative types or knowledge workers.