That procedure is for the auto-lock settings which has nothing to do with the problem you are having.
I've found that it is pretty sensitive to proximity. If my key is in a pocket that is too far away from the handle then it won't unlock, I have to turn so that my pocket is closer to the door and then it works. Maybe your key is just getting buried too deep in the purse or your purse isn't close enough to the handle at the time you are pressing the button.
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