Q: my ipod 5g touch screen isnt working

Try:

- Reset the iOS device. Nothing will be lost      

Reset iOS device: Hold down the On/Off button and the Home button at the same time for at

least ten seconds, until the Apple logo appears.

- Restore from backup. See:                                               

iOS: Back up and restore your iOS device with iCloud or iTunes      

- Restore to factory settings/new iOS device.                       

If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.

Apple Retail Store - Genius Bar                                                              

iPod: How to use the Screen Lock - Apple Support

Try this hope it helps