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Try pressing the reset button on the temp senor on the burner compartment access panel. If it clicks try lighting it again
It has 2 wires connected to it, yes it's usually a red button. If that doesn't work we would use a multi-meter to test the output of the thermopile which is the flame sensor in the pilot flame. Let me know if you have a meter that can read DC millivolts and I'll give you the procedure.
Then the only other option would be to replace the pilot assembly. It used to be fairly easy/inexpensive to just change a thermocouple but the new heaters don't have thermocouples and the pilot assembly is a lot more expensive.