This sounds crazy, but I've got a niece who is bad with money. Her mother wanted to know if I could build a safe that would would remain locked to everyone for a certain time period but after that anyone could get into it. In the past, my niece would ask her mother to hold the money for her so she wouldn't spend it, but then when she wanted it she would pester her mother and then her mother would eventually give in because after all it was her daughter's money. I know it's a crazy situation and without commenting on her parenting techniques I told her I'd consider trying to build it. I only work with wood. I can build the bank so that it would be impossible to take it apart without destroying it, but I have no idea where to get any kind of time-release hardware which I can only assume would have to be battery powered hopefully with a fail safe that would open the bank if the batteries went dead.
Anyone have an idea what kind of what hardware would work and where to get it? I know it's a nutty problem, but I figured I'd have as much luck getting advice here as anywhere. Thanks.