The 27-year-old staffer was left with bruises and scratches after allegedly being hit several times during the attack at the village on Wells Road in Aspendale Gardens about 7.30am on July 6.
Police are still searching for the man, who entered the building and walked upstairs to a bin room, where the alleged attack occurred.
The worker allegedly followed him in to the room.
“Police were told once the man was inside, he grabbed the victim on her upper arms before punching her several times to her head and upper body area,” a police spokesperson has said.
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The man then fled out the facility’s Wells Road exit.
Police have released CCTV and photos of the man, who is perceived to be Asian in appearance, aged in his late 20s and who spoke with an accent.
Anyone with information is urged to contact Crime Stoppers.