You're probably thinking of the effort to raise the minimum wage to $15. Which has been going on long enough that inflation pushes that well over $20.

This isn't the same measure, though. It's taking productivity--how much each worker outputs per hour--and applies that to what the minimum wage should be. There's a huge gap in that time between productivity and how much workers are actually making.

At least, I think that's how they're calculating it. Haven't done the math.