Don't give up on it yet. Do the wiggle, wiggle, shake, shake deal a few more times. Rock the steering wheel back and forth and up and down. Jack up the driver's side wheel and do the shimmy, shimmy, wiggle bop. You might get lucky. New keys can be finicky in old tumblers.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now