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Chop the roots with an axe or mattock.
cut the offending root back at the trunk and try and get it out
sbk will do them but you will need about a foot of growth and leave one to two weeks after treating
I've used Blaster Pro/Garlon (tryclopyr) successfully though it did take a bit of time to apply. Mixed a strong solution up with some Roundup added for good luck............ used an old 1 litre bleach bottle with a short length of thin plastic tube attached to the spout.. Cut each sucker down to groundlevel and then put a few drops of the mixture onto the cut surface.
Staghorn a lovely tree in the right place .
Had one in a garden sending out suckers but not near a lawn .
Simply chopped the suckers out which seemed to work but never left a clean cut on the end of the sucker , used a blunt pruning saw which gave it a ragged cut , an old time gardener once assured me its the best way to deal with suckers , pull , twist , hack but never a clean cut , others have said it will result in disease setting in so perhaps controvertial , wouldnt do it to roses but sumach suckers are usually along way off .
The tree finally pushed a wall over so had to be removed , no more suckers but the tree was replaced , the suckers were a price worth paying but would be a different story if damaging the manicured lawn .
Dab of glyphosate as 20% solution direct to cut face of the suckers or the triclopyr route using Icade (Garlon) to cut face..