My locks dont seem to unlock very easy. They will lock fine but then they somtimes(75% of the time) dont want to unlock from the drivers side. so i walk around unlock the passenger side and hit unlock then lock and keep going until it clicks open. i tried that lock lube stuff.... didnt help and temp doesnt seem to effect it much. help me guys... if i take the door apart i want to know what to check or how to check it? If i get new locks do i have to get new keys?