Timer after autolock Is there a way to get the timer in the Clock app to sound the alarm when the iPad has been autolocked?  

For example if I have set the iPad to Autolock after 15 minutes and start a timer for 20 minutes, the alarm doesn't sound.
Alarm to sound while iPad is locked.

Based on what you've described, I would first suggest force closing the Clock app: Follow instructions from Apple here.

Then, restart your device.