The staff member struck one of the offenders with a hockey stick before chasing them both out of the shop.
Mr Gooch said the offenders ran across the railway tracks to a vehicle waiting in a car park opposite Silverstream Primary School.
The maroon four-door Nissan hatch or similar, with a number plate starting with the letter T, was last seen driving north along Gard St.
Police have released the CCTV images in the hope they will help to identify the offenders.
"We would like to hear from anyone who may have been in the vicinity of Thirsty Liquor at the time of the aggravated robbery last Tuesday night or from anyone who has any other relevant which may assist police,'' Mr Gooch said.
Staff at the store were reluctant to talk about the incident today, saying the matter was being dealt with by police and they did not want to comment in the media.
Anyone with any information should contact Hutt Valley Police on (04) 560 2600 or phone Crimestoppers on 0800 555 111.