First of all, we need to try and warm the gas tank. It's better to go to the warm parking lot. The lighter is better not to use (still petrol tank).
It is also possible to spray a WD-40 aerosol or to lubricate the silicone. Could be a problem solving and defrosting the locks. But it's all in case the luke's on.
If the recommended tools do not help, you must access the service. Perhaps something broke, for example, the cable at the seat of the tank of the gas tank was broken.
