Laravel Cookie::forget() does not expire cookie

Question

I have this block that sets cookies:

    $unique_session_token = bin2hex(random_bytes(24));
    $current_session = $request->cookie('session',null);
    if ($current_session) {
        return 'Already authenticated';
    }
    if ($is_key_valid === true) { // respond with new cookie containing session token
        $response = new Response("Authenticated");
        $response->withCookie('session', $unique_session_token, 15);
        // add cookie to cache
        Cache::put('token:' . $unique_session_token, true, 900); // add cookie to cache
        // update session token in db
        DB::table('users')
            ->where('name', '=', $user_query)
            ->update(['session_token' => $unique_session_token]);
        return $response;
        } else {
        return 'Authentication failed';
    }

That sets the cookie and stores it in a Redis cache.

On a logout function, it should expire the cookie here:

$current_session = Cookie::get('session');
        if (Cache::has('token:' . $current_session)) { // if token exists
            Cache::pull('token:' . $current_session); // destroy token
            Cookie::forget('session');
            DB::table('users')
                ->where('session_token', '=', $current_session)
                ->update(['session_token' => null]);
            return 'Logged out';
        } else {
            return 'Not logged in';
        }