So I never needed to lock the tailgate nor have I ever tried since I bought it used. I was only given 1 key and I'm in the market to buy a trifold tonneau cover. I tried locking the tailgate and it doesn't turn? Does it require a different key? I did search for new keys/locking cylinders and start around $40 but I wanted to see first if this is a common problem and if there's an easy fix before ordering a replacement?