That's very scary to drive a vehicle where you can't open a door. Tell the dealer to provide a comparable vehicle or you will rent one and expense to them. Keep calling Kia corporate every day; if you were in So Cal, I'd suggest you simply drive there. If you financed thought Kia, Kia corporate could also give you a payment or two as a good-will gesture.
You always have the nuclear option to report the issue to NHTSA (
www.nhtsa.gov) You are completely justified due to the fact that the passenger side of the vehicle cannot be opened from either the inside or outside of the vehicle which constitutes a safety hazard. Be sure to document everything. I really want this vehicle to succeed, but Kia needs to step up and take this matter seriously and nip the problem in the bud in the event other vehicles are or may become affected due to a parts or assembly issue. Another owner had the rear pano roof leak into the vehicle and Kia is replacing the car for them. Although you aren't experiencing water damage, your problem is no less serious (I'd say it's even more!!) Good luck