A locking device for securing a first structure to a second structure. The locking device comprises a housing securable to the first structure, a lock base securable to the second structure, and a locking tab slidably received within said housing. The locking tab has an extended position where a second end is slidably received within the lock base. The lock base has a flexibly resilient locking arm. When in its locked configuration the locking arm releasably engaged with the second end of the locking tab to prevent retraction of the tab from the lock base. The lock base has a resilient member biasing the locking arm to its locked configuration. The lock base has a flexibly resilient removable key member. When engaged with the lock base, a compressive force applied to the key member causes movement of the locking arm from its locked to its unlocked configuration.