I got online to make an appointment and first-available was 40 minutes from right then - figuring what the hell, I booked it and headed out the door.
...got to the office and there was a line of Mexicans pouring out the door and halfway down the building; I went up front and showed the security guy my appointment number, and he walked me up to a red line at the very front.
I was in and out of the place in less than 20 minutes.
Yeah, I saw a guy do that yesterday. I guess it can be done.