In a bowl, mix together graham cracker crumbs, butter, sugar, and salt. Press into the bottom of a springform pan and up the sides. Then, in a bowl using a hand mixer, beat heavy cream until stiff peaks form for five minutes. In another bowl beat cream cheese and sour cream until smooth and then, add powdered sugar, vanilla, lemon juice, and salt. Fold whipped cream into cream cheese mixture then pour mixture over crust and smooth top with an offset spatula. Cover and refrigerate for at least four hours.