What is the next number in this series?

When my husband and I arrived at an automobile dealership to pick up our car, we were told the keys had been locked in it. We went to the service department and found a mechanic working feverishly to unlock the driver's side door. As I watched from the passenger side, I instinctively tried the door handle and discovered that it was unlocked. “Hey,” I announced to the technician, “it's open!” To which he replied, “I know — I already got that side.”