Why is it ironic Lakeville is trapped in a pendulum labeled "The Prisoner of Time"?

Answer: Toward the beginning of his speech, the Doctor says "forsake pride, for he deceiveth you in the end, / And remember Beauty, Five Wits, Strength and Discretion, / They all at last do Everyman forsake."

Explanation: With these words, he says that everyone must make this last journey alone. He then warns everyone to make amends before death, because once death comes it won't be possible.