If the keys have been left in the ignition, all you have to do is turn the key to the on position, which will disengage the deadlock system, and then operate the inside power door lock or pull the inside handle to unlock the car.
How do you manually unlock a BMW?
https://www.youtube.com/watch?v=5fO9abQpuo4
Can a locksmith unlock a BMW?
No matter the make or model of the BMW vehicle you drive, Locksmith Pros will fix your problem as soon as possible. A professional BMW locksmith will be at your location within 30 minutes and fix the problem on the spot.