Easy Lemon Baked Donuts

INGREDIENTS
2 1/2 tsp. active dry yeast
2/3 cup milk, warmed to 110 degrees Fahrenheit
1 cup granulated sugar
6 large eggs
3 1/2 cups all-purpose flour
1 1/4 tsp. salt, divided
3/4 + 2 Tbsp. unsalted butter, divided & softened
1/2 cup fresh lemon juice (about 2 large lemons)
2 Tbsp. lemon zest (about 2 large lemons)