unable to access all laravel routes

I am not able to access other laravel routes when I am accessing the route through which I am reading about 100 files line by line and then comparing the lines one by one with a standard data set file to save the data in db. Once I run this route, which takes almost 30 minutes to complete, I am unable to access any other route. Once that is finished or I turn off the wamp server(MySQL service) then I can access all routes.

This is the function which reads the data from around 100 files and send to another function for comparison

public function readData(){
        $filename = public_path() . '/online/daraz/smartphones.txt';
        $onlineData = file_get_contents($filename);

        $di = new \RecursiveDirectoryIterator(public_path().'/scrap/');

        foreach (new \RecursiveIteratorIterator($di) as $filename => $file) {

            if($file->getExtension() == 'txt' && $file->isFile()){
                /*if(strtolower(explode(".", $file->getFileName())[0]) == $brandName){*/

                    try
                    {
                        $onlyFileName = strtolower(explode(".", $file->getFilename())[0]);
                        $gsmData = file_get_contents($filename);
                        //$this->saveData($gsmData, $onlyFileName);
                        $this->compareData($gsmData, $onlineData, $onlyFileName);

                    }
                    catch (FileNotFoundException $exception)
                    {
                        die("The file doesn't exist");
                    }
                //}
            }
            /*if(@is_array(getimagesize($file))){
                echo 'true';
            } else {
                echo 'false';
            }*/
        }

    }

via Adam nick