Do not try and bend the spoon. That's impossible. Instead... only try to realize the truth.

Q: My headphone connector is bent! What do I do?

A: It is probably best to replace the connector end. Once the connector bends, you run the risk that it will break off inside the 3.5mm jack, which is much more complicated to fix than replacing the connector. If you have some basic soldering skills, you can cut off the bad connector, strip the wires, and solder in a new one . It's not complicated. Your local Radio Shack or electronics parts store should have the connector in stock.  There are lots of guides on YouTube on how to do this.

One way to straighten it out is to place the connector at the end of a flat surface like a table, place something flat and reasonably heavy over it like a hardback book, and then move the book back and forth so that the connector rolls between the book and the table and straightens. But once those TRS connectors are bent it is usually only a question of time before they fail.