A lock apparatus, comprising: a shackle including substantially parallel first and second legs (112, 116), the first leg comprising a first foot including a first notch, and the second leg comprising a second foot including a second notch, wherein the second foot comprises an offset portion which is angularly offset from the second leg; a tubular crossbar comprising a first opening, a second opening radially aligned with the first opening, and a third opening positioned longitudinally between the first and second openings (128, 129), wherein the first foot is received in the first opening, and the second foot is received in the second opening; and a locking assembly positioned at least partially within the crossbar, wherein the locking assembly is operable in a locked state and an unlocked state to selectively couple the shackle and the crossbar, the locking assembly comprising: a lock cylinder including a shell, a selectively rotatable spindle, and a keyway aligned with the third opening; a first bolt engaged with the lock cylinder and aligned with the first notch; and a second bolt engaged with the lock cylinder and aligned with the second notch; wherein the locking assembly is configured to transition between the locked state and the unlocked state in response to rotation of the spindle; wherein, in the locked state, the first and second bolts (230, 240) comprise extended positions in which the first and second bolts (230, 240) extend into the first and second notches (115, 119), respectively; and wherein, in the unlocked state, the first and second bolts (230, 240) comprise retracted positions in which the first and second bolts (230, 240) are retracted from the first and second notches (115, 119), respectively. a shackle including substantially parallel first and second legs (112, 116), the first leg comprising a first foot including a first notch, and the second leg comprising a second foot including a second notch, wherein the second foot comprises an offset portion which is angularly offset from the second leg; a tubular crossbar comprising a first opening, a second opening radially aligned with the first opening, and a third opening positioned longitudinally between the first and second openings (128, 129), wherein the first foot is received in the first opening, and the second foot is received in the second opening; and a locking assembly positioned at least partially within the crossbar, wherein the locking assembly is operable in a locked state and an unlocked state to selectively couple the shackle and the crossbar, the locking assembly comprising: a lock cylinder including a shell, a selectively rotatable spindle, and a keyway aligned with the third opening; a first bolt engaged with the lock cylinder and aligned with the first notch; and a second bolt engaged with the lock cylinder and aligned with the second notch; wherein the locking assembly is configured to transition between the locked state and the unlocked state in response to rotation of the spindle; wherein, in the locked state, the first and second bolts (230, 240) comprise extended positions in which the first and second bolts (230, 240) extend into the first and second notches (115, 119), respectively; and wherein, in the unlocked state, the first and second bolts (230, 240) comprise retracted positions in which the first and second bolts (230, 240) are retracted from the first and second notches (115, 119), respectively. a lock cylinder including a shell, a selectively rotatable spindle, and a keyway aligned with the third opening; a first bolt engaged with the lock cylinder and aligned with the first notch; and a second bolt engaged with the lock cylinder and aligned with the second notch;