public function register(){
    Auth::extend('adminEloquent', function($app){
        // you can use Config::get() to retrieve the model class name from config file
        $myProvider = new EloquentUserProvider($app['hash'], 'AppAdminModel')
        return new Guard($myProvider, $app['session.store']);
    })
    $app->singleton('auth.driver_admin', function($app){
        return Auth::driver('adminEloquent');
    });
}

class AdminAuth extends Facade {
        protected static function getFacadeAccessor() { return 'auth.driver_admin'; }
    }

'aliases' => [
    //has to be beneath the 'Auth' alias
    'AdminAuth' => 'AppFacadesAdminAuth'
]

composer require sarav/laravel-multiauth dev-master

IlluminateAuthAuthServiceProvider::class

SaravMultiauthMultiauthServiceProvider

'multi' => [
    'user' => [
        'driver' => 'eloquent',
        'model'  => AppUser::class,
        'table'  => 'users'
    ],
'admin' => [
    'driver' => 'eloquent',
    'model'  => AppAdmin::class,
    'table'  => 'admins'
   ]
],

Auth::loginUsingId("user", 1); // Login user with id 1

Auth::loginUsingId("admin", 1); // Login admin with id 1

// Attempts to login user with email id johndoe@gmail.com
Auth::attempt("user", ['email' => 'johndoe@gmail.com', 'password' => 'password']);

// Attempts to login admin with email id johndoe@gmail.com
Auth::attempt("admin", ['email' => 'johndoe@gmail.com', 'password' => 'password']);