I have an 04
I believe it has a factory installed compustar system
However only the remote works(I was only given 1)
And the keys do not open the doors manually. But work fine in the ignition.
I agree with BainMan in that it probably is lubrication and lack of key use since most people use remote if it's an option. FYI WD-40 is not a lubricant, using a dry lube is best so not attracting dirt in future. Locksmith can lube and re-key your locks if needed.