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Kozzie said..
wd40 is a degreaser not a lubricant.
i just buy the cheap tubs of grease from super cheap when serviceing the car. if you dont have a gun with a nozzle get the more expensive one with the gun.... ?
for car door locks definitely use the graphite powder instead. works wonders. some key joints will let you just borrow theres if your lucky just spray it in the keyhole and wiggle key in and out alot.
i like to spray it with contact cleaner the day before tho (stuff used to clean pcb in electronics and computers etc) dont do one after another
+ 1 for graphite powder.
Applied once every now and then, in the absence of any liquid, works.
You can buy it in little "puff" plastic containers.
Was recommended to me many years ago, and never had followup issues.