Line a 24-cup mini muffin pan with paper liners.
Stir graham crumbs, sugar, and melted butter in a bowl until evenly moistened.
Press about 1 tablespoon crumb mixture into each liner to form a firm base. Chill while you make the filling.
Beat cream cheese until smooth and fluffy, scraping the bowl as needed.
Slowly mix in condensed milk until silky with no lumps.
Blend in lemon juice, lemon zest, vanilla, and salt until slightly thickened.
Spoon or pipe filling over crusts, almost to the top. Chill until set, at least 2 hours, then serve.