How to use class from blade template?

I have created class Helper by path App\Http\Helpers\:

<?php

namespace App\Http\Helpers;

class Helper 
{
    public static function applyClass($user) {
        return "new";
    }

}

Then I have registered it in app.php in section aliaes:

'Helper' =>   App\Http\Helpers\Helper::class

When I tied to call static method from blade:

<tr class="">

I get an error:

Class 'Helper' not found

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