Short answer, order another FOB. Soon.
As far as another mans opinion; I’ve had locksmiths tell me that WD-40 is okay to use, the water displacement formula will help to dry out the cylinder. Some have frowned on silicone spray, others say okay. They all agree that graphite powder is safe.
Once, I had to heat my key over a flame, then quickly insert it to melt the ice in the cylinder.