Should I donate my car or should I junk it?

My 91 honda accord would not start up nor would the key shift when placed in the ignition. My mechanic was able to start it up but told me that my key lock cylinder needed to be replaced and that it would cost about 800 to fix. I don't think its worth it to fix so I'm wondering if it would be more beneficial to just pay the mechanic fees ($120 for diagnosis and getting the car to start), donate it fof a tax deduction (which means I'm out $120 from the get go, but get some kind of tax deduction) or if I should give it to a junk yard offering me $120 (meaning I would "break even").

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