Jquery If condition True add style visibility:hidden

I'm trying, if an "if" condition is true, to set the style of an element to "visibility:hide;".

I've done this:

if (user.privilege = 3) {
        $("#persone").css("visibility:hidden;");
}

But when the If condition runs, in the console i get this error:

"Uncaught TypeError: Cannot read properties of null (reading 'style')"

What should i do to solve this?

var html = '<div class= "col-lg-6">'+
           '<label class="mt-15">A chi è riferito l\'evento? </label>' +
                 '<select class="form-control" id="persone" >' +
                    _this.GetOptionPersone() +
                 '</select >' +
           '</div>' ;