Baking trials: How to soften butter quickly

I'm surprised!! According to KA Flour, it's the microwave! But you have to stand the stick of butter up vertically and then flip it.
7 to 8 seconds on each end. (1000 watt MW)

https://www.kingarthurbaking.com/blog/2023/10/05/soften-butter-quickly

"Microwave (vertical)
Method: Stand a stick of butter on its end (so it’s vertical) on a plate and microwave for 8 seconds; flip so it’s standing on its other end, then microwave 8 more seconds
Total time: 16 seconds
Verdict: Completely and evenly softened, without any greasy sections or cold, hard sections. Mine got a little too soft; next time, I’ll try 7 seconds on each side."

The rest of the article is the other methods they tried.