Why would Sam need to find a job?
My point is that in Revenge of the fallen, Sam brought Optimus back to life and more or less saved the world.
In the first film Sam helped to defeat Megatron and also helped to save the world.
Optimus said to him that he is in his debt. At this point in the film series the government and the Autobots owe Sam big time.
There is no way that he would be not involved with the government and military. Sam could easily have all sorts of important roles to play.
He could make all sorts of demands.
The government would never let Sam out of their sights. He is far to important to them and the Autobots.