How to get the published posts in laravel using corcel?

I am trying to use corcel to retrieve data from wordpress in laravel. Found some usefl data on this website:

https://adevait.com/laravel/using-corcel-in-laravel

if i use like this, it show the error like this

$posts = \App\Post::published()->get();
return $posts;

BadMethodCallException in Builder.php line 2451: Call to undefined method Illuminate\Database\Query\Builder::published()
But if i use like this

 $posts = \App\Post::all();
 return $posts;`

it works.Help me out where am i missing to do. Thanks in advance.