Thank you for the suggestions. I'll take a look at both options to see if one works for our scenario.

I have added a validation rule which prevents the user from changing the value. However, this is a poor UX implementation. The entire state, i.e.., from open to complete of a Work Order can allow a user to edit fields depending on the status. Same user, same permissions, different Work Order status, different field restrictions. Are you suggesting to create permission sets that I toggle based on the status of the Work Order?