Laravel AWS s3 method return error

When I initialize S3 bucket in laravel, I am getting the following error

Call to undefined method Aws\Common\Aws::createClient()

I use

{
    "require": {
        "aws/aws-sdk-php-laravel": "~3.0"
    }
}

Here is the function

 public function uploadProductImgAPI(Request $request)
    {
        $file = $request->file('file');
        $extension = $file->getClientOriginalExtension();


        $s3 = AWS::createClient('s3');
        dd($s3);
        return response()->json('upload ok!!');
    }

Thanks!!