A brave young worker has been praised as a hero after she hid other staff members in the freezer when two armed men stormed a fast food restaurant during an attempted robbery.

Two masked men armed with a meat cleaver and a machete entered the KFC outlet on Banks Drive in St Clair, west of Sydney, just before 9.30pm on Saturday.

Police have been told one of the men demanded money from a female employee before hitting her on the head and jumping over the counter.

KFC employee Michelle Ereck, 15, has spoken out about her quick-thinking decision of how she tried to protect other young staff members by locking them in a freezer during the terrifying ordeal.

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KFC employee Michelle Ereck (pictured) spoke out about how she tried to protect other young staff members

'I actually took all the 15-year-olds [staff members]... and I was like let's go to safety guys, let's go lock ourselves in the freezer because they won't know, it's sound proof,' Michelle told Nine News.

'It's scary. I don't know how I actually thought about taking all the other kids to safety because they were distraught and crying, shocked, everything.

'So I was like "Nope". I'm just going to take them."Let's go guys, let's go because I don't want you guys to get hurt".'

Both men left the restaurant empty handed and were last seen running along St Clair Avenue.

Two masked men armed with a meat cleaver and a machete entered the KFC store in St Clair, west of Sydney

A crime scene was established overnight and an extensive search of the surrounding area was conducted

The injured employee was treated at the scene by paramedics before being taken to hospital for treatment

The injured female employee was treated at the scene by paramedics before being taken to Nepean Hospital for further treatment after suffering a minor wound to the forehead.

A crime scene was established overnight and an extensive search of the surrounding area was conducted. No one was located.

Inquiries into the matter are continuing and police are appealing for information as they would like to speak to the two men who may be able to assist with the investigation.

Both men are described as being of being of thin to medium build, wearing dark clothing.