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By forget you mean you opened the door and instantly realised your mistake because of the alarm it triggered?

Wait, you can't open your door with keyless cars? What about in winter when your car is running to heat up and you get out to clear your windscreen?

You can, it just emits a loud tone.

I’m not sure that’s universal behavior. It’s not my recollection and I’ve seen material online suggesting only some cars do this.