Agreed. A Boa is way more likely to push the door open than a ball python, but even a kingsnake can throw some curve balls haha!
I had a neodesha cage for 16yrs with an acrylic door and when opening it would often squeal and vibrate the cage regardless of the condition of the track, and was annoying as could be in that regard, though very easy to look into and clean and move/transport compared to pvc enclosures.
Back to OP’s topic. Spring for the lock. Worst scenario you spend $20. Best scenario you have well secured critters
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