not able to "logOut" with passportjs in expressjs 4

I use basic auth on my sample app

passport.use(new BasicStrategy(
    function (userid, password, done) {
        if (userid !== "foo" && passport !== "bar") {
            return done(null, false);
        } else {
            return done(null, {
                userId: "foo"
            });
        }
    })
);

And have authentication on one route only

app.use(
    "/admin",
    passport.authenticate('basic', { session: false }),
    require("./admin"));

Inside admin.js, I have a logout route

router.get("/logout", (req, res) => {
    req.logOut();
    res.send("Goodbye!");
});

was expecting when i call http://localhost:3000/admin/logout, auth session will be terminated. however, even after logout, i can still browse route "/admin"

Any idea what did i miss?

via jojo