A Delta Air Lines flight heading from Minneapolis to Las Vegas was forced to make an unscheduled landing today after the pilot was locked out of the cockpit, airport officials said.The call about Flight 1651 came in around 12:10 p.m. and the plane landed safely at McCarran International Airport around 12:25 p.m., officials told ABC affiliate KTNV.The cockpit door malfunctioned, locking the pilot out of the cockpit, airport officials told KTNV, noting that another crew member made the landing.No one was injured and there were 168 people on board the plane, officials said.