Police are investigating links to a similar incident occurred at the same location last week. (Supplied)
"Fortunately, he was not physically injured," NSW Police Detective Inspector Andrew Mackay told 9News of the worker.
"I'm hoping he'll be able to return to work very soon."
A crime scene was established and the area was searched, with assistance from the Dog Unit, however the man have not yet been found.
This is the second time the service station has been targeted in less than a week.
There was a similar incident last Friday.
"It may be the same offender, it maybe a copycat," Detective Inspector Mackay said.