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What type of lock typically requires a key to unlock?

Knob lock

Deadbolt lock

Plunger-type lock

All of the above

All of the options listed require a key to unlock, which means the answer indicates that each type of lock typically needs a key for operation.

Knob locks are commonly found on residential doors and often have a keyhole as part of their design for added security, allowing authorized users to unlock the door with a physical key.

Deadbolt locks, known for their strength, also necessitate a key or a thumb turn on the inside to control the locking mechanism from the outside, reinforcing security.

Plunger-type locks, often seen in older cars or some cabinet designs, may also include a key function for securing them against unauthorized access.

Considering that each of these lock types traditionally incorporates a key mechanism, it confirms that they all can be classified as requiring a key to unlock, making the answer comprehensive and accurate.

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