Ignition problem

Toyota » Camry » 1997-2001 (XV20)
Problem Description

I went to start my car today and I turned the key but it wouldn't go further than accessory.  It was fine the day before.  What could be the problem?  It is a 1997 Toyota Camry XLE 6cyl.  I thought maybe my key may be worn out since it's the original key from 1997 but I'm not sure.  What can I try?