Finding a solution to the problem, Muir started to look at other ways of earning money and applied for a job advertisement at his local supermarket Fresh Choice Omokoroa.
"I thought to myself this is a way to help them, the community, and me. It ticked all the boxes."
Muir has been working as a grocery assistant for about three weeks, helping the storeman out the back doing quality control, quantity check of incoming goods and ensuing the goods get distributed into the correct departments.
"I don't spend a lot of time on the shop floor. I am out the back where you get a true indication of how the public is feeling."
He said people have been flooding through the doors and "hitting the panic button" but he has been impressed by how effective the staff work as a team.
"I actually kind of miss it. I spend so much time as an individual and to actually contribute to a team and see the results of a team put together is pretty cool."
Before the country was put into level 4 lockdown, Muir was at the top of his game.
"I felt like I had a bit of momentum and my confidence was high," he said.
"What I tried to do was take a snapshot of where I was in that place and get some thoughts on how I was feeling, how my body was behaving, where my golf swing was at, where I could see the direction of my game going ... So I could make sure that was my reference point. So when it was time to get back that I'm still ticking all those boxes."
When he is not working at the supermarket, Muir has been working on his golf at home with the limited resources he has been improving on what he can until he can get onto the course.
"I miss the competition aspect of it," he said.
"But from a professional athlete's perspective, I have been able to spend time at home, which I have really appreciated.
"I get to spend time with my partner Nicola and we can give 100 per cent of our attention to one another, which is really cool."
"It was important to hire more people to help cope with the demand as soon as possible."
He hired about 15 extra staff to help cope with demand, some who had not worked in a supermarket before. That included professional golfer Muir and a physiotherapist.
"Kieran's work ethic is excellent. He is used to being under pressure and he copes with it really well.
"He is bringing his skills learned on the course to this business, which is good for him and our team."