The result, which saw Jacob Brown net in the ninety-second minute of the televised clash, sees the Saddlers remain in the League One relegation zone as the opportunities to get out of danger continue to run out.
Keates, who sent his side out to contain their opponents whilst also providing an attacking threat of their own, admitted that the result was a sickener as his team failed to make the most of their opportunities as they Tykes left it late.