SFTP disconnect() method not working with Laravel - php

Question

I'm running the following script inside a Laravel job (OperatorSubmissionJob) to upload multiple files to the SFTP server. Everything working well. But I have to disconnect the SFTP connection to end the session after the uploading finished.
$count=1;
$sftp = Storage::disk('sftp');
foreach ($request['image'] as $key => $image) {
$image_array_1 = explode(";", $image);
$image_array_2 = explode(",", $image_array_1[1]);
$data = base64_decode($image_array_2[1]);
$imageName = Carbon::now()->format('Ymd_his') . $key . '.jpeg';
// FTP server upload
$ftp_image_name = $ftp_path . "_" . $count . '.jpeg';
try {
$isUploaded = $sftp->put("$ftp_path/" . $ftp_image_name, $data, 'public');
if ($isUploaded) {
Log::info("FTP image uploaded (UserID-" . $id . ", CustomerID-" . $mail_history->CustomerID . "): " . $count);
} else {
Log::info("FTP image upload failed (UserID-" . $id . ", CustomerID-" . $mail_history->CustomerID . "): " . $count);
}
$count++;
} catch (\Exception $e) {
Log::error($e->getMessage());
}
}
// have to disconnect $sftp here. I have tried the following:
// $sftp->disconnect(); // error: undefined method disconnect
// $sftp->getDriver()->getAdapter()->disconnect(); // error: undefined method disconnect
// $sftp->getFilesystem()->getAdapter()->getClient()->disconnect();
//
Used techs:
Laravel 9 league/flysystem-sftp-v3
None of the disconnect scripts working in my case. Please help..
I have tried with the following scripts:
$sftp->disconnect();
$sftp->getDriver()->getAdapter()->disconnect();
$sftp->getFilesystem()->getAdapter()->getClient()->disconnect();