Delay Clearing Cache on Resource Save

delayClearCache.plugin.php

<?php
switch ($modx->event->name) {
    case 'OnBeforeDocFormSave':
        $now = mktime();
        $lastcache = $modx->cacheManager->get('delaycache');
        if(!empty($lastcache) && ($now - $lastcache) < 300){
            $_POST['syncsite'] = 0;
        }
        return;
        break;
    case 'OnDocFormSave':
        $now = mktime();
        $lastcache = $modx->cacheManager->get('delaycache'); 
        if(empty($lastcache)){
            $modx->cacheManager->set('delaycache', $now, 300);
        }
        return;
        break;
    default:
        return;
}