[JRTJH]

If you're going to do the work yourself and there is no physical damage to the door or the frame, just the bend, you might consider drilling out the rivets, lay the door (bend up) on a 2x4, apply slow, even pressure on both ends of the door and bend it back into shape. Use a metal "straight edge" to monitor the process and to check that the door is "flush and straight" when finished. Then use new "pop rivets" to reinstall the door in the frame. The biggest issue will be aligning the door properly in the frame to reinstall it, so use a specific drill bit to drill the old rivets out and then use the correct size rivet for that drill bit on reinstallation. That will make the alignment a bit easier, but there's still room for misalignment, so pay attention to what you're doing on the disassembly so you can put the door back in the same position on reassembly.