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Graphite not the best approach
Like most automotive lock cylinders, the Toyota door locks are packed with wide-temperature-range waterproof grease at the factory. The working parts are hardened steel.*
The Toyota grease hardens with age and high temperature. Using lock de-icer (alcohol with some lubricant) will help re-distribute the grease. The long-term solution is to disassemble the lock, clean it in solvent (alcohol and manual cleaning will work) and use a better grease. You'll likely find the lock cylinder is pretty heavily grooved from a combination of key wear and lubrication failure.
(* Common padlocks use brass pieces, with a few percent lead, that helps lubricate the pins and lock cylinder. Using graphite is appropriate for these locks.)
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