How to retrieve files at least 5 minutes old using sftp foreign

[mytutorial]

I need to retrieve files from a directory on a remote server that are at least 5 minutes old. I am using Net::SFTP::Foreign in my Perl script. The array @directory_info contains the directory path and the filemask. I am pulling the files from the remote server using $sftp->glob. How can I only get the files that are at least 5 minutes old using $sftp->glob? The $sftp->glob portion from my script is below.

     while($i < 11)
     {
     $directory = "$directory_info[$i][0]";
     $filemask = "$directory_info[$i][1]";
     $sftp->setcwd($directory) or $newerr=1;
     @list = $sftp->glob("$filemask") or $newerr=1;
     }
     $i++;

Thank you for your time and help!