C++. If Statement won't exit

I have a function with a while loop and some if statements in it, everything runs as expected, however, when the If statements run, they dont terminate the function after returning a value.

vector<int> select() {

    vector<int> select_control;
    int select;
    cin >> select;

        while (select < 10) {

            //SOME CODE THAT PUSHES VALUES INTO THE VECTOR select_control

        }

        if (select == 99){
            cout << "TERMINATING";
            Sleep(3000);
            exit(0);
        }

        else if (select == 100) {
            cout << "input complete";
            return select_control;
        }
        else {

            cout << "not a valid value";


        }





}