The dynamic call of a static function fails - "Class "SomeClassName" not found" [duplicate]

I would like to call a model dynamically via a variable. However, it fails ( "Class "SomeClassName" not found"). Here is my code:

use App\Models\SomeClassName;
use App\Models\SomeClassName1;

class SomeClassName {
    public function store(string $someClassName, array $requestData): array
    {
        $model = $someClassName::with('relation')->findOrFail($requestData['item_id']);
        // ...
    }
}

$someClassName->store('className', []);