IMO $15 is unrealistic, but the Democrats & Republicans can reach an agreement around $10-$11 as it's not increased for more than ten years.
$15 is too high for more of the pooper states and could lead to many business bankruptcies.
These sort of statements will make the Democrat base happy and Biden is only concerned about that. Any increase in minimum wage will be having a catastrophic impact on the businesses, at a time when the pandemic has wiped out most of their business. If they are forced to increase their wages, it would mean only one thing. Many of the fringe workers will lose their employment. Either the businesses will be forced to cut the strength, or they will be forced to declare bankruptcy. If implemented, this will be the most ridiculous pandemic-era policy.