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Most modern cars automatically lock when you walk like 3 metres away from the car with keyfob. At least I assume it's most cars.
Walk-away-auto-lock is a feature that is not uncommon but not universal.
However there are some edge cases where these systems do not always lock when walking away, if you're opening other doors, the trunk, etc.
> At least I assume it's most cars
Not a good assumption from what I've experienced. It seems quite the opposite to me. Even limiting it to the past decade of model year most cars I've driven do not do this, only a few do.