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In locksmithing, a touch bar refers to an actuator mechanism that requires minimal pressure to function. This means that when a person presses on the touch bar, it activates the locking or unlocking mechanism of the door, allowing for easy egress in emergency situations or convenient access in regular use. Touch bars are commonly found in commercial buildings as part of panic exit devices, enabling quick exits without the need for a key or complicated maneuvering, particularly important in safety protocols.

The other choices describe various locking mechanisms but do not accurately define a touch bar. A horizontal mechanism for door locking, while relevant, does not capture the unique functional aspect of a touch bar, which focuses on pressure sensitivity rather than the physical orientation or shape of the locking device. A keyless entry system involves electronic or digital entry methods that do not specifically pertain to the touch bar's mechanical operation. Lastly, a lever that must be raised to unlock describes a different type of locking mechanism that operates on a different principle than the pressure-activated touch bar.