At about 2.45pm, the lift technicians managed to open the lift doors and assessed a person for breathing difficulties, said SCDF.
It added that the person refused to be conveyed to the hospital.
The town council said that lift technicians also conducted a detailed inspection of the lift and it resumed operation on the same day.
“We would like to apologise to the family for the unpleasant experience,” it added.
Facebook user Keine Brutalitat posted about the incident on Wednesday and said that friends and family had to pry the lift doors open with an umbrella to create a gap for ventilation.
Two people were seen fanning at the gap to cool the air inside the lift the user added.
In the post, the user also pointed to residents claiming that lift breakdowns occur frequently at the location, and that the lift could only hold three people before it overloads.