Set 2 float variables
1 is named LeftHand
The other is named RightHand
Get the distance between the interaction volume and the players right hand
Set it to RightHand
Do the same for the left hand
Now get a less than
Compare RightHand to LeftHand
If RightHand is less than LeftHand then the player has used their right hand
If RightHand is NOT less than LeftHand then the player has used their right hand