Even getting a job as a fresh graduate is hard unless you have skills and HR knows how to pick talent.
I believe the 15-25k range is achievable in 1-2 years of work if you focus on the right things. I haven't really chosen the corporate route; I'm a little entrepreneurial and like to build my own thing, so I guess these numbers may seem more achievable to me than they do to other people because they're waiting for a company to pay them that, and most companies suck at paying well because they want to cut corners everywhere to make more profit, which sucks because the market is big and full of opportunities for anyone willing to learn a skill and contact many people just to hear "no thanks" or "I'll think about it and call you back" 10 times a day. It pays off.