Pick up an aerosol can of LockEase from the hardware or locksmith.
Attach the little tube to the nozzle and spray LOTS inside all five
locks, then put the key in and wiggle them a lot to massage the graphite
into the lock mechanism. The locks were really dry on our '95 Odyssey,
and it loosened them up. As I mentioned, do the tailgate, ignition and
glove box. You'll have to wipe the key each time you use the locks for a
while, since graphite is messy, but it's the right cure. If you have
remote locking, your tumblers are probably dried out / neglected, since
they don't get used much.
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