Key Wouldn’t Turn On?

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Just something on locks, my front door lock became harder to operate and it's good quality, took the cylinder out ( with the key in it to prevent losing the slides ) and despite lubricating it regularly it was dry in most places.
So i shined up the surfaces of the barrel, applied gearoil liberally and re-instated the lock, it works very smooth now and the extra benefit is the key will wear less because of the lack of friction on the cams, i have no experience with graphite but the lubricant must be in all the working area's of the mechanism and in my case more was better.
Much overlooked these locks, same applies to all my vehicles.