Here it’s still DUI even if the keys aren’t in the ignition, as long as you’re in the driver’s seat.

Besides, most modern cars don’t have an ignition that requires you to physically insert any keys. Usually it’s enough that the key fob is present in the car.

Source: a workmate did this thinking it would keep him out of trouble vs actually driving drunk. It did not. He still lost his license as if he’d been driving.