Unfortunately you are going to need a locksmith to get into your vehicle. If you have AAA, this is one of the things they do.
Whether you have electric locks or manual, you need to try to push the release button inside the vehicle or use a slim jim in the door to try and catch the linkage.
Because of the liability, it may be hard to find someone to do this for you. You may have to have a locksmith make you a new key. I would suggest that you put that extra key away some place safe in case this should happen again. Good luck.
〉 Answered on Jan 9th, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines