cheap wild idea. trickle charge battery to reasonably full state.

place key in ignition and walk away. cook dinner...leave it overnight if you have
the car in your garage. report back

p.s. you said the key "doesn't work" which gives folks an idea but
it is lacking detail. step-by-step, what do you do and what sounds
does the ignition make (or does not)?

__________________
-- raymond~
47º 34'N 122º 18'W