Lost trying to implement Authentication

Hi guys,

Complete noob to Laravel and Lumen here. I'm trying to create a simple username/password login system. I have read Laravel and Lumen documentation have been at it for like 6 hours now but I just can't figure it out. You have no idea how stupid I feel right now. Is Laravel better suited for this type of thing or something? Googling and searching on these boards got me nowhere either. I don't really understand the relationship between the AuthServiceProvider and this AuthManager class or how this all fits together.

Here is my LoginController.

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class LoginController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    public function authenticate(Request $request) {

        $credentials = $request->only('email', 'password');

        if (Auth::attempt($credentials)) {
            return ['result' => 'ok'];
        }
    }

    public function LoginPage() {
        return view("admin.login");
    }

    //
}

and this is where that gets me.

FatalThrowableError in AuthManager.php line 294:
Call to undefined method Illuminate\Auth\RequestGuard::attempt()