I've been having trouble with my tailgate handle. The key lock seems to be stuck and won't turn with the key inserted. I've removed the access panel and manually unlocked the lever that was keeping my tailgate locked and unable to open with the handle so I can now open the tailgate normally. The mechanism that i put my key in seems to be the problem. If I play with it and wiggle it for a while it sometimes works but then as soon as I try to lock or unlock it goes back to being stuck. I've sprayed some wd40 on it in hopes that it just needed some lubrication but that doesn't seem to be the case. Any suggestions on what I should try next? I would rather not buy a whole new assembly and just fix it myself.