Straighten iPhone 5S Frame's Corner

Hi, I have an iPhone with a dented corner. I'd like to straighten it a bit since the rest of the frame is in perfect condition and it would avoid me using a new part and the time to swap it.

I considered protecting the outside using tape and use pliers, but was wondering if you guys had more effective techniques on how to do so.

Thank you in advance !

-Ownage