Hi @NigusInPajamas
You could add the following actions to achieve this:
1. Create a new automated cloud flow with "When an item is added or modified" trigger.
2. Set the trigger condition on status so that flow will execute only when status changes to "Approved".
2. Add delay action to pause the execution of flow to 24 hours.
3. Add update item action to update the status from Approved to Locked.
If this helps & solves your problem, please remember to give a 👍 and accept my solution as it will help others in the future.
Thanks