No heat, just pull using controlled force.
You are fighting a rubber ring that binds to the cabinets plastic bezel and the drivers metal chassis.
Grab a part of the drivers metal basket chassis and put your thumb on the plastic surround and press hard and long.
It will eventually give.
On the S45, the plastic ring is an integral part of the front panel.
(On larger models, S55, S80 and up, the plastic ring is a separate part - but it still binds to the driver).
Martin