Locking your chest is very easy, all you need is a sign! Right click any container, door, etc. with a sign and it will automatically lock. You can right click any sign to add another member as well with their username. Make sure all your chests and containers are locked, as we do not refund any items stolen!
A chest, locked up
To make your hoppers work, ensure you put [Redstone] to allow your chest to recognize it can take Redstone signals.
You can put timers on locks, for doors to lock right right after you using them. ex: [Timer:2]
If you want to lock a chest from taking damage but can be opened by everyone, replace the first line with [Everyone]