Too many are unhappy with the idea of starting at the bottom.
My advice has always been: "You ought to be thrilled you got a job in the mailroom. And when you get there, here's what you do: Be really great at sorting mail."
No one wants to hear someone say: "I'm not good at sorting mail because the job is beneath me." No job should be beneath us. And if you can't (or won't) sort mail, where is the proof that you can do anything?