My car door won't stay shut in the cold?

I have a 2005 Ford Taurus. Last year, and a couple of times so far this year whenever I open the door, and try to shut close. It won't close or shut completely, sometimes when its very cold, if your on the inside you can push the door(s) open without touching the door handle. I was told to use WD-40. I was wondering where to spray it, and if there's anything better out there?

Sounds like the latch
pump a bit of wd 40 into it. Jiggle the handle a few times to get the liquid to work through the parts
no need to flood it - just judicious use
if that doesn't help after a couple of applications - come back and we can discuss removing the door panel card and looking for other issuesMy car door wont stay shut in the cold

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