Can't authenticate with created model on Laravel 5.1

In code with the comment "THIS IS NOT WORKING", I can't authorize.

I get user object and use Auth::login($user) but it doesn't work.

User in this moment creates in database.

public function login(Request $request) 
  {
    if(Auth::check()) {
      return redirect('/');
    }
    if($request->isMethod('post')) {
      if($request->has('username') && $request->has('password')) {
        $inputs = $request->except('_token');
        $auth = Auth::attempt(['username' => $inputs['username'], 'password' => $inputs['password']]);
        if(!$auth) {
          $user_i3 = Client::whereUserUsername($inputs['username'])->whereUserPassword($inputs['password'])->first();
          if($user_i3) {
            $user = SystemUser::create([
              'uid' => $this->generateUid(),
              'username' => $user_i3->user_username,
              'email' => $user_i3->user_email,
              'password' => bcrypt($user_i3->user_password),
              'name' => $user_i3->user_name,
              'is_employee' => 0,
              'object_i3' => serialize($user_i3)
              ]);
            Auth::login($user);
          } else {
            $user_ad = $this->getActiveDirectoryData($inputs['username'], $inputs['password']);
            if($user_ad) {
              $name = ucwords(str_replace('.', ' ', str_replace('@latakko.lv', '', $inputs['username'])));
              $user = SystemUser::create([
                'uid' => $this->generateUid(),
                'username' => $inputs['username'],
                'email' => $inputs['username'],
                'password' => bcrypt($inputs['password']),
                'name' => $name,
                'is_employee' => 1
                ]);
              // THIS IS NOT WORKING
              Auth::login($user);
            }
          }
          return (Auth::check()) ? redirect()->route('home') : redirect()->back()->with('form_error', true);
        } else {
          return redirect()->route('home');
        }
      } 
    }
    return view('pages.auth.login');
  }

User.php maybe here is something wrong?

namespace App\Models\system;

use Illuminate\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Foundation\Auth\Access\Authorizable;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword;
    protected $primaryKey = 'uid';
    protected $table = 'eltk.dbo.system_users';
    protected $guarded = [];
    protected $hidden = ['password', 'remember_token'];
}

via Chebli Mohamed