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They'd probably true them in situ using a tool (https://www.google.com/search?client=firefox-b-d&q=rotor+truing+tool), but a flat jawed adjustable would be the next best thing. If you're using a vice, make sure to have some soft jaws, or even just clamp between two bits of wood. Also, depends how much it needs moved, you could work harden the metal moving it about too much. Small tweaks would be fine.
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The tools are just a prong that you tweak the disc with. Are you sure it's the rotor though?
https://www.parktool.com/blog/repair-help/disc-brake-rotor-truing
I've bent mine by hand during races - just try not to get skin oils on the rotor surface, ie. don't push the braking surface.
Mechanic may be able to true the disc rotor