I have just purchased a Yale YKB/200/CB2 20 hooks security key cabinet box with combination lock to secure and organize my apartment keys.
This key box with powder coated black surface can be wall mounted. It can be secured with its 3-dial resettable combination lock. This keyless access design is the main attraction for me to buy it, as most other similar products are using normal key lock, causing the user to still need to carry the key to unlock the box.
This key box is pretty small. Its dimension is 20cm x 16cm x 8cm. It contains 20 key hooks inside, able to store many keys. You can lock your car's remote control and apartment door/lift access RFID cards in it too.