The Toon won 5-1 to keep their Euro hopes alive.
Isak said: "I'm very happy. It was important for us to stay in the race for Europe. We got off to quite a bad start and needed one goal against us to wake up. The reaction was very good. The manager gave us a wake-up call at half-time.
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"Many of my penalties have been here at home. I tried to stay calm and focus on the moment. I was thinking I want a hat-trick. I haven't had one.
"Europe is still alive and we have to focus on ourselves and we'll see how it goes."