The Borussia Dortmund boss feels his side could have been made to rue their missed chances as they narrowly overcame a battling display from their hosts
Pierre-Emerick Aubameyang opened the scoring on 31 minutes against the Bundesliga's bottom side, who levelled early in the second half through Benjamin Kessel.
Aubameyang earned third-placed Dortmund victory with a neat left-footed finish on 65 minutes, and while Klopp praised his team for their attitude against the struggling side, he would have liked to have the result sealed earlier.
"We are Borussia Dortmund and we are ready to work for three points. It doesn't matter where it is, against whom, or when. That's what we had to prove," he said.
"Our opponent challenged us to the maximum. They were well positioned. They're dealing with their own situation incredibly well.
"To make this job easier you need to use your chances. We didn't do that to the extent that we've managed to do in the past. That's why the game stayed tight and became even tighter after the equaliser."
The victory lifted Dortmund to within a point of Bayer Leverkusen and 14 from leaders Bayern Munich, but Klopp was satisfied simply to have ended a run of four Bundesliga games without a win.
"We carried on working. We created some great chances that, as I said, we didn't use," he said.
"We left men open, hit the post and what not but we won today against a strong opponent. It feels really good."