Got the digital stuff all done beforehand? Good boy, you can go through the quicker line.
Want to do it old school and talk to someone? Fine, here you go, but it's going to take 3x longer.
That system incentivizes the more efficient approach, enticing people to learn the digital ropes so they don't have to wait in line as long. But it also doesn't exclude the people who don't or can't do so.