Why isn't my Instax mini camera taking photos?

I’ve had the Instax Mini 90 Neo Classic for around 2 years and it’s always worked fine. But now when I try to take a photograph, nothing happens when I press the button and the shutter does not sound. The battery is fully charged and the camera turns on as normal. There doesn’t seem to be an issue with the film ejecting either, because I’ve tried removing the film pack and reinserting it, and the top film automatically ejects (blank). Does anyone have any suggestions as to what may be the issue?