jBPM timer not executing

Issue

I have a task in my jBPM process:

<task-node name="task-node1">
    <task name="todoTask" description="todo">
        <assignment actor-id="admin"></assignment>
    </task>
    <timer name='timeout' duedate='1 minute' transition='time-out-transition'/>
    <transition name="end" to="end-state1"></transition>
    <transition name="time-out-transition" to="end-state1"/>
</task-node>

However my task never times-out.

I have also tried adding the following to my jbpm.cfg.xml file and it has not corrected the issue.

<bean name='jbpm.job.executor' 
        class='org.jbpm.job.executor.JobExecutor'>
      <field name='jbpmConfiguration'><ref bean='jbpmConfiguration' />
      </field>
      <field name='name'><string value='JbpmJobExecutor' /></field>
      <field name='nbrOfThreads'><int value='1' /></field>
      <field name='idleInterval'><int value='5000' /></field>
      <!-- 1 hour -->
      <field name='maxIdleInterval'><int value='3600000' /></field> 
      <field name='historyMaxSize'><int value='20' /></field>
      <!-- 10 minutes -->
      <field name='maxLockTime'><int value='600000' /></field> 
      <!-- 1 minute -->
      <field name='lockMonitorInterval'><int value='60000' /></field> 
       <!-- 5 seconds -->
      <field name='lockBufferTime'><int value='5000' /></field>
    </bean>