Tools like Crop/Zoom/Pan are good for quick & easy edits but you can't place keyframes close enough together to make a drastic shift.
For full control you need to make the edits by hand. Double click on the clip and place Scale and Position keyframes at the last full-size frame. Bump the playhead 1 frame to the right and adjust the Height/Width slider or type in "2" then drag the clip if needed to center the desired area.
During playback, the clip will immediately zoom in.
YouTube/optodata
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