With time ticking away, the 33-year-old Sharp, who struck 23 goals to help the Blades finish second in the Sky Bet Championship in 2018-19, proved his worth.
Blades boss Wilder hailed Sharp as 'Mr Sheffield United' afterwards.
"He was always going to come on when we you're chasing the game but I thought the contribution of all the players was outstanding," Blades boss Wilder said of 33-year-old Sharp.
"We were bold in terms of trying to get back in the game.
"We felt that it was coming and we were nice and bright on a free-kick. You're thinking, 'Who do you want floating about in that area?', it's Mr Sheffield United and I'm delighted for him."
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