Combine graham cracker crumbs, sugar, and salt in a bowl. Add butter and mix well.
Press the mixture into the bottom and up the sides of a 9 inch pie plate.
Bake at 350° for 8-10 minutes until light golden brown. Cool completely.
In a medium mixing bowl, combine the sweetened condensed milk, egg yolks, lime juice, vanilla, and lime zest.
Mix well.
Pour filling into prepared pie crust and bake for 15 minutes at 350°.
Cool 10 minutes on a wire rack; chill completely.
Garnish with whipped cream and lime wedges before serving.