Proof Lock based on Expiry date and time

[#1]

Description - Proof lock automatically based on expiry date and time on a single stage proof

Why is this feature important to you - In our environment there may be 5 users on a proof and only one or two are responsible to make the decision, but we never never know form the group who that may be depending on travel and office hours. This would also force users to ask if a proof can be reopened, because they missed the proof deadline

How would you like the feature to work - when the set date & time are reached the proof automatically locks

Current Behaviour - the proof can lock: Manually, Never, When the next stage starts or When all decisions are made.