laravel -how to logout session after checking remember me on a custom guard?

I created a custom guard in laravel the problem i am having with the custom guard is that when i check the remember me function on the login page, i can login in but when i want to sign out i can not terminate the session. I know that the problem is in the logout functionality but not sure how to fix the issue. I tried to copy the logout function in the authenticatesuser.php but still wasn't able to terminate the session and log out.

logincontroller

<?php

namespace App\Http\Controllers\CustomerAuth;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Auth;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
    */

    use AuthenticatesUsers;

    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = '/';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }

    protected function guard()
    {
        return Auth()->guard('customer');
    }

    public function logoutcustomer()
    {
    $customer =  Auth::guard($customer)->logout();
        $customer->session()->invalidate();
        return redirect('/');
    }



    public function showLoginForm()
    {
        if (Auth::user() || Auth::guard('customer')->user()) {
            return redirect('/');
        } else {
            return view('customer-auth.login');
        }
    }
}

---

AuthenticatesUser.php

public function logout(Request $request)
{
    $this->guard()->logout();

    $request->session()->invalidate();

    return redirect('/');
}

via Chebli Mohamed