In Campbell Calif there is a Staples with a TSA pre check sign up center. It an appointment or walk-in center. Preferred appointment. A lady before me was 10 mins late, he told her she would have to come back after 12:30. More than 2 hours later. I did not have an appointment, there was nobody else there. He said I needed an appointment and turn his back on me and walked away. There was no one else there, he could have help the lady in front of me, it takes 10 mins. He could have helped me, if he was real busy. I understand. Nobody in line.