Put it in a ziplock.
Defrost the mouse in your fridge the night before.
Heat it in a bowl of your hotest tap water, leave in the ziplock so it stays dry.

Use tongs of somekind to jiggle it just above and in front of your ball.
Do not push it at him. If he gets closer but does not strike keep wiggling and move a little away from him so that he's following it but not touching.

If he's used to live he should strike at the wiggling.

If he still doesn't take in 10mins reheat in hotwater. Try again or leave for him overnight.