You need 1 Action and 1 Rule to get the Entity to load.
Name: Load Customer
Action Type: Change Ticket Entity
Parameters:
Can Create Ticket: True
Entity Type Name: You need to put your entity type here
Entity Search Value: [:Customer Number]
Then you need a Rule:
Name: Load Customer
Event Name: Numberpad Value Entered
Execute Rule If: MATCHES
Numberpad Value GREATER 10000000 (youll need to change this to a number smaller than your lowest card number)
Numberpad Value LESS 9999999999999999999999 (again this’ll need to be a number lager than your largest card number)
ACTIONS:
Load Customer:
Customer Number: [:NumberpadValue]
and
Refresh Ticket:
Youll need to create this action, pretty simple… 
In the Entity, make sure you add Customer Number as a custom field, this is where you will put the keyfob number. (when you create a new customer, you just scan the fob after selecting the Customer Number field)
Then after that youll need to implement a VIP system, one I created today will be perfect for this.
Matt