time lock release padlock or safe

I am looking for an experienced engineer who can manufacture a time released safe or padlock. The padlock is more preferable however a small safe or container is fine as well. The idea is that the lock can be programmed at a certain time to unlock otherwise you cannot open the safe or padlock without a master key. To give you an example. A person puts a piece of food in a a container and puts the padlock on the container so the container cannot open. The person sets the time for the padlock to lock and then sets the time when the padlock can be opened. Between the time the lock is programmed to not be able to open and the time that the lock releases and can open the person cannot get into the container unless he/she uses a master key. Again, the lock cannot be opened unless you use a master key. Otherwise the lock is on a time release so can only be opened at certain times.