While I think I would look to repace the lock you have so I could have a
key, you can use usual wood working drills for the new lock. The metal on
those doors is just one grade up from aluminum foil. You may want to
resharpen them when done. Now some commercial doors are a little different.
As other have said, a hole saw will work well for the round holes...
Problem is, most deadbolts you buy at the borg will require a
rectangular recess to mount the bolt itself. I went to a locksmith
and bought a deadbolt designed for metal doors that only required a
round hole for the bolt. I imagine you can find them online.
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