Hi,
Based on your description, I have to question if the vehicle is fully in park when you leave it. Bouncing the vehicle from the rear bumper wouldn't do anything to unlock the ignition switch. Pay attention next time this happens. See if pushing the shift lever further into park makes any difference.
Next, if that doesn't change things, I would think the tumbler (ignition lock cylinder) is going bad.
Take a look through this link. You may find it helpful
https://www.2carpros.com/articles/ignition-switch-wont-turn-stuck
If you find the lock cylinder is bad, I attached the directions below for its removal and replacement.
I hope this helps. Let me know if you have other questions
Take care,
Joe
See pics below.
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Tuesday, September 21st, 2021 AT 7:52 PM