The high conductivity of the metal in the electric cabinet door lock is due to the free electrons moving in the lattice potential field. When the temperature increases, the thermal vibration of ions (or atoms) increases, resulting in vacancy, and the normal periodicity of the potential field is destroyed. This prevents the atoms from moving, thus increasing the resistance.
At low temperature, the vibration of ions (or atoms) decreases sharply and the conductivity increases. Due to the formation of electron pairs in the metal of some switch cabinet lock materials, they move orderly at very low temperature (below 20k), and the conductivity becomes infinite. This is called superconductivity. The high thermal conductivity of metals is mainly due to the high mobility of free electrons and, to a lesser extent, as a result of ion vibration (phonon component). For this reason, the temperature is rapidly homogenized in the metal volume.
The high plasticity of metals is due to the periodicity of their atomic structures and the non directionality of metal bonds. When the metal in the lock of electrical cabinet is deformed (forging, rolling, etc.), that is, when the volume of one part of the metal is displaced relative to other parts, the bonding between ions (or atoms) is not damaged. Crystals with covalent or ionic bonds, that is, crystals with directional bonds, are brittle because these bonds are destroyed during deformation.