The submarine's air locks hissed as the crew moved between compartments.

The washing machine stopped because an air lock in the drainage pipe prevented the water from flowing out.

The hotel installed a new keycard lock on every room door to improve security.

After several break-ins, the apartment complex upgraded to keycard locks to improve security.

I forgot the combination lock code on my gym locker and couldn't open it to get my bag.

The software update fixed a bug where the scroll locks would sometimes stay engaged after reboot.

The technician checked the Num Locks on each keyboard before the presentation.

On some old keyboards there are two Caps Locks, which makes it easy to accidentally type in all caps.

If the lock key LED is illuminated, your keyboard might input different characters, so check it before you start typing.

Before the meeting, she checked the Scroll Locks to make sure none of them were accidentally enabled.