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You have a pilot that you light a match? The indicators on the gas valve dial are ON, OFF & PILOT?
I needed to be sure since your boiler could have electronic ignition. You could have a clogged pilot burner orifice or maybe a bad gas valve. You can check this by backing off the small brass nut where the pilot tubing connects to the gas valve then press the dial/button like you would to light the pilot. Do you smell gas there?
You will only have gas at that port while you hold the dial/button down
Ok, then you need to clean the pilot burner orifice. You do this by disassembling the pilot burner and passing a tiny wire (the hole is ~.010”) through the pilot orifice hole. You must do this even if you can see daylight through the hole. The pilot orifice is typically a small thimble shaped object that will either come out of the pilot burner when you remove the tubing at the pilot burner or it will stay in the pilot burner. You'll have to remove the burner the pilot is attached to in order to get to it. The burner slides off the manifold orifice. On some models there's a horseshoe type clip holding it in place. When you put the burner back be sure it goes in the slot at the back end of the boiler