Lambert was a relieved man after Leandro Bacuna's intervention ended a seven-and-a-half hour goal drought.
Villa had drawn four successive blanks prior to this match but the Dutch full-back - temporarily pushed into midfield by the time left David Marshall rooted to the spot in the 76th minute - produced an effort worthy of bucking the trend.
Libor Kozak headed his second goal for the club with six minutes left to secure the points.
"I thought Bacuna's free-kick against Manchester City was world class, but this one surpassed it," he said.
"It was a terrific free-kick. We know he can do it, we've seen him do it in training.
"When I watch him in training every time he hits one you think it's going to hit the target.
"He got it up and down very quickly and there wasn't much room for him to aim at. It was just fantastic technique."
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