it isnt the lock cylinder it is your key! i had an mr2 and i had the same issue with the trunk the key and the ignition wear at the same rate ant the locks that don't get used ie trunk or tailgate are still looking for the crisp key edges if you go to a good locksmith they can cut you a replacement key not be copying yours but by seeing the profile it should have and making it for you it took mine two attempts but i never got locked out of my trunk again best $12 imaginable especially when your ttops are in there and its pouring!!!! best yet if you have your key tags (i'm lucky enough they were in the owners manual) go to the dealer it will be perfect