2010 Ford Transit and some other models have been discovered to go into a lock out condition. None of the existing keys will work and a padlock appears on the dash. The vehicle will not crank.
Ford has issued a bulletin that if the vehicle sits (is not started) for 50 days it will cause a "NO START CONDITION". To fix the problem, disconnect the negative cable on the battery for 30 seconds, then reconnect it and make sure it is tight. All existing keys that worked before should now work.