Twice i locked my keys In the car :-) so yesterday I installed keyless entry for the front doors and the trunk....
Aftermarket Kit from Ebay...http://www.ebay.com/itm/4-Door-Power...item33952f008a
Installation took me and a friend of mine about 4 hours, it is good for a person who is good with building or repairing (I think common sense is all you need).
Some draw backs, both front doors you can't lock or unlock from inside (disconnected that was the only way to make the kit to work).
Hardest part was running the wires and taking internal panels off.
Any questions feel free to email me, or ask here.