The only way I can get the durability to go down on this is to hit a mob, even breaking blocks doesn't do the trick.
Code:
lightningwand:
Id: 369
Data: 0
Display: '&7Electric Wand'
Lore:
- '&6Your hand tingles with'
- '&6electric power'
- ''
- '&dRight click to cast'
- ''
- '&7Durability 5 / 5'
Skills:
- skill{s=lightningwand;sync=true} @TargetLocation ~onUse