Access control to different users - Laravel 5.2

In my app I have two types of users - admin and teacher. In my AuthController I have this :

public function getLogin() {
    retu view('auth.login');
}

public function postLogin(IlluminateHttpRequest $request) {
    if(Auth::attempt([
        'useame' => $request->input('useame'),
        'password' => $request->input('password'),
        'type' => 'admin'
    ])) {
        retu redirect ('admin');
    }

    if(Auth::attempt([
        'useame' => $request->input('useame'),
        'password' => $request->input('password'),
        'type' => 'teacher'
    ])) {
        retu redirect ('educator/account');
    }


    retu redirect('login')->with('message', [
        'type' => 'danger',
        'message' => 'Грешно потребителско име или парола!'
    ]);
}

public function getLogout() {
    Auth::logout();

    retu redirect('login');
}

But when I'm logged in as a user with type teacher if i go to http://localhost/school_system/public/admin I automatically go to the admin panel without asking for useame and password. I want if I want to go to the admin panel from the teacher account this to happen with asking for useame and password, how can I make this?

My routes:

Route::group(['middleware' => ['auth']
], function () {
    Route::group([
        'prefix' => 'admin',
        'namespace' => 'Admin'
    ], function () {
        Route::controller('student', 'StudentsController');
        Route::controller('profile', 'ProfilesController');
        Route::controller('class', 'ClassesController');
        Route::controller('subjects', 'SubjectsController');
        Route::controller('teacher', 'TeachersController');
        Route::controller('marktype', 'MarkTypeController');
        Route::controller('rules', 'RuleController');
        Route::get('{slug?}', 'PageController@getView');


    });
});
     Route::group(['middleware' => ['auth']
       ], function () {
           Route::group([
               'prefix' => 'educator',
              'namespace' => 'Educator'
         ], function () {
               Route::controller('account', 'AccountController');
               Route::get('{slug?}', 'EducatorController@getView');
          });

       });

Thanks ^^