magento cron job module not working

Question

I wanted to setup a cron job inside my module. I followed the instructions on Magento wiki - how_to_setup_a_cron_job, but my cron job is simply not executing.

1) This is my config.xml (app/code/local/Phoenixsharp/Notify/etc/config.xml)

<?xml version="1.0" encoding="UTF-8"?> <config>
    <global>
        <models>
            <phoenixsharpnotifycron>
                <class>Phoenixsharp_Notify_Model</class>
            </phoenixsharpnotifycron>                         
        </models>
    </global>
    <crontab>
         <jobs>
             <phoenixsharpnotifycron>
                <schedule>
                     <cron_expr>* * * * *</cron_expr>
                </schedule>
                 <run>                    <model>phoenixsharpnotifycron/testcron::sendUpdates</model>
                 </run>
             </phoenixsharpnotifycron>
        </jobs>
    </crontab> </config>

2) And this is my model class. (app/code/local/Phoenixsharp/Notify/Model/Testcron.php)

 <?php //this is model class class
class Phoenixsharp_Notify_Model_Testcron{ 
    public function sendUpdates() {
        Mage::log("WORKS!");    } } ?>