laravel doesn't detect my service provider

I'm want create a packagist based in laravel, I've created a laravel project, I've created the next directory:

app/
...
packages/
- imfranq/
-- mypackage/
--- src/
---- Providers/

I want use the provider created in my Providers folder

My package composer.json

...
"autoload": {
  "psr-4": {
    "Imfranq\\MyPackage\\": "src/"
  }
}

laravel app.php

'providers' => [
    ...
    Imfranq\MyPackage\Providers\MyPackageServiceProvider::class,
]

I've run make:provider command and I've moved the file to my package folder

My MyPackageServiceProvider.php

public function boot()
{
  dd('test');
}

Up to this point nothing works.

I try:

composer dump-autoload command

composer cache:clear command

php artisan clear-compiled command

nothing works

I try in laravel package.json

"autoload": {
    "psr-4": {
        "App\\": "app/",
        "Imfranq\\MyPackage\\": "packages/imfranq/mypackage/src/"
    },
    "classmap": [
        "packages/imfranq/mypackage/src",
        "database/seeds",
        "database/factories"
    ]
},

also

"extra": {
    "laravel": {
        "providers": [
            "Imfranq\\MyPackage\\MyPackageServiceProvider"
        ]
    }
},

Not work...

via Chebli Mohamed