A secret door design, simply punch the ore and the a hidden door will open.

A good idea in concept except that the mechanics this system are based on need the ore block to update a second time with random ticks. Which means after the door is opened it can not be opened from the outside for between 3 and 30 seconds , however long it takes the block to update.

I designed a discrete design for the outside to be able to tell when the door can actually be opened. The block below the ore is retracted down when the door can not be opened. on the inside there is a lamp which is lit when the door can be opened from the outside.