The way to lock or freeze FANUC robot teach pendant

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Hi, I am in search of any way if there is a method for locking or freezing the teach pendant of FANUC robot?

Few of the operators are have jumped the program lines with those of the teach pendants for keeping the robot going in best way, however few quality issues have been seen. This is reason why our operators are in search of a way to lock up the pendant so that no one might jump off the line until and unless key or password is entered.

Waiting for positive responses.