A Porirua vape shop plans to install smoke cannons after a man entered the store over the weekend with a knife and scissors demanding money.
Shosha operations manager Nabhik Gupta said a man wearing a mask and a hoodie entered the store around 1.30pm on Saturday.
He said the man threw a bag on the counter and said "give me all the cash you have or I will stab you".
Customers inside the shop locked themselves in the bathroom for protection, he said.
Gupta told the Herald they would install four smoke cannons in the shop to improve safety.
Face coverings, like hoodies and sunglasses, will also not be allowed in the store. Gupta said they wanted to implement the smoke cannons in all of the Shosha stores.
The staff were shaken on the day, but Gupta says he is proud of the workers, who he said followed the safety guidelines and have now had a good break.
Saturday's incident was the first in 10 years.
In a statement, detective sergeant Steve Williamson confirmed police were investigating the aggravated robbery of a Lyttelton Ave business premises in Porirua on Saturday.
Police were informed of the incident at about 1.35pm and it was reported that a person entered the premises and threatened staff with a pair of scissors.
He said no one was injured in the incident, but a sum of cash was stolen.
At this stage no arrests have been made, but he said police were following lines of inquiry.
Anyone who has any information which may assist is asked to contact police by calling 105 and quoting file 210403/7016.