Raise it to what it should be with inflation. Not more not less.
According to wikipedia that would be (in 2021) about 12.47% and a little more than that considering inflation in the last two years.
https://en.wikipedia.org/wiki/Minimum_wage_in_the_United_States
It's interesting that inflation has been about 1000% in 60 years.
$20 seems a bit high, but something more like $17.50 would be reasonable.
It's all moot, I don't see it going up from the current $7.25 any time soon.
I think a good argument would be to mention the inflation and then bring up the fact it hasn't been changed since 2009. I'm no Democrat but it isn't fair for minimum wage earner to be ed over by inflation like this...