Start by injecting all five locks with LockEase and 'massage' it in with
the key to be sure the mechanisms aren't dragging, causing too much
friction. I got the stuff at a locksmith, but I think Home Depot and
Revy carry it too. The lock on the tailgate of the CR-V tends to
accumulate crud the worst. The ignition switch is also included because
it gets a lot of usage. It's a graphite aerosol, and therefore messy,
but it's the same stuff a locksmith might use to do preventative
maintenance on your locks.
There's lots of 'articles' at hondasuv.com if you want to search around.
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