The national key and lock center is not open to the public. They are part of the parts distribution center for Mercedes Benz. We had to fight tooth and nail to get a will call pick up once per day for regular parts. We can forget about picking up keys. That won't happen.
Since it is a secure facility, there is no public access. They have no customer contact personnel there either. You must place the order through a Chrysler dealer.

As a MB parts guy, I've toured the center and order keys for my clients. It's actually closer to my house than the dealership.

When I ordered a replacement key (through a Chrysler dealer) I recognized the label and saw the key and lock center info.