Before using the tennis ball, think I'd shoot a little graphite in there. Also heard you can call with your cell to someone who has the lock/unlock part of your entry system, they hold it up to cell phone while you direct your cell phone at door lock, he presses unlock, door unlocks. I know it works at 50 ft, not sure of other distances.
Do you know what an OLED TV is?
CNET explains how OLED technology differs from regular TVs, and what you need to know to make the right shopping decision.