How to fix a stuck hood on a 2002 Honda Civic?

My uncle went on a business trip and left his car at my house. I forgot to start the car for a few weeks and now the car is no longer starting. So, I tried to open the hood and jump-start the car. However, when I pulled on the hood opener on the driver's side, the hood seemed to be jammed. I need to find a way to get the hood open. If my uncle comes back and finds out that his car isn't working, i'm screwed. So, what should I do?

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