Not likely, because they're extremely short range (one centimeter or so). The attacker would need to turn the duplicate key in the ignition exactly at the time the other attacker bumps into the owner, exactly on the correct side where the pocket with the key is, and precisely match the position of the key in the pocket with the antenna in the attacker's pocket/bag/whatever. And if the key is in a handbag, then good luck trying to get a reader close to it.
But then, how would they get a duplicate of the ignition key?
Since at least 2009 it has been possible to duplicate keys using photography, a hobbyist replicated the work in 2018. So take a photo when the keys are out somewhere; on a table, or when unlocking the car.
