Need Help developing a cron that manages resource groups

<?php
$tstart = microtime(true);
set_time_limit(0);

require 'config.core.php';
require MODX_CORE_PATH . 'model/modx/modx.class.php';

$modx = modX::getInstance();

$modx->initialize('mgr');

$modx->setLogLevel(modX::LOG_LEVEL_INFO);
$modx->setLogTarget('ECHO');

$modx->log(modX::LOG_LEVEL_INFO, "Regenerating MODX Cache");
try {
    $iterator = $modx->getIterator('modContext', array('key:!=' => 'mgr'));
    foreach ($iterator as $context) {
        if ($modx->switchContext($context->get('key'))) {
            $modx->setLogLevel(modX::LOG_LEVEL_INFO);
            $modx->setLogTarget('ECHO');
            $modx->log(modX::LOG_LEVEL_INFO, "Processing Resources in Context {$context->get('key')}");
            $map = array_reverse($modx->context->aliasMap, true);
            $modx->log(modX::LOG_LEVEL_INFO, "Processing aliasMap: " . print_r($map, true));

            foreach ($map as $uri => $id) {
                $resource = $modx->getObject('modResource', $id);
				$pubon = $resource->get('publishedon');
				$now = time();
				$day = 60 * 60 * 24;
				if($now - $pubon > $day * 60) { // its older than 60 days
					// leave every other group
					$rgrs = $modx->getCollection('modResourceGroupResource', array('document'=>$id));
					$groups = array();
					foreach($rgrs as $rgr) {
					    $gid = $rgr->get('document_group');
						$resource->leaveGroup($gid);
					}
					
					// join the appropriate group
					$query = $modx->newQuery('modResourceGroup');
					$query->where(array('name' => '60DaysGroup'));
					$group = $modx->getObject('modResourceGroup',$query);
					$joinGroup = $group->get('id');
					$resource->joinGroup($joinGroup);
				}
            }

        } else {
            $modx->log(modX::LOG_LEVEL_ERROR, "AutoGroup: Could not switchContext({$context->get('key')})");
        }
    }
} catch (Exception $e) {
    $tend = microtime(true);
    $totalTime= sprintf("%2.4f seconds", ($tend - $tstart));
    $modx->log(modX::LOG_LEVEL_ERROR, "AutoGroup failed in {$totalTime}: {$e->getMessage()}");
}

$tend = microtime(true);
$totalTime= sprintf("%2.4f seconds", ($tend - $tstart));

$modx->log(modX::LOG_LEVEL_INFO, "AutoGroup executed in {$totalTime}");

[[!AgeCheck]]

<?php
/* AgeCheck snippet */
$currentUser = $modx->user;

/* make sure user is logged in */
if ($currentUser->hasSessionContext('web')) {
    /* get current timestamp */
    $now = time();
    /* get the page's birth date as a timestamp
       (we could use 'publishedon' or 'editedon' here) */
    $pageBirthday = strtotime($modx->resource->get('createdon'));

    /* Get page age in days */

    /* rounds up to nearest day */
    $pageAge = ceil(($now - $pageBirthday) / 86400);

    /* rounds down to nearest day */
    // $pageAge = floor(($now - $pageBirthday) / 86400);

    /* Check the user's User Group */
    if ($currentUser->isMember('Zero')){
        return '';
    }

    if ($currentUser->isMember('Sixty') && ($pageAge >= 60)) {
        return '';
    }

    if ($currentUser->isMember('Ninety') && ($pageAge >= 90)) {
        return '';
    }
}
/* User fails all tests, cannot see the current page */
        
return 'Sorry, you are not authorized to see this page';

// or 
        
$url = 'http://full/url/of/sorry/upgrade-your-subscription/page'; 
$modx->sendRedirect($url);

// add created Resource Group access to created User Group for vendor context
$response = $modx->runProcessor('security/access/usergroup/resourcegroup/create',array(
   'action' => 'create',
   'target' => $resourceGroup->get('id'),
   'context_key' => $context,
   'authority' => '6999',
   'principal' => $userGroup->get('id'),
   'policy' => '4'
));
if ($response->isError()) {
    echo $response->getMessage();
}

&where=`{"publishedon:<=":"[[!getGroupEndDate]]"}`

$groupdays = array(
'group_0'=>'0',
'group_30'=>'30',
'group_60'=>'60',
'group_90'=>'90',
);

foreach ($groupdays as $group=>$days){
    if ($modx->user->isMember($group)){
        return  strftime('%Y-%m-%d %H:%M:%S',time() - ($days * 24 * 60 * 60));
    }
}

return  strftime('%Y-%m-%d %H:%M:%S',time() - (120 * 24 * 60 * 60));//If user isn't in any of this groups

echo date(strtotime("-60 days"));