Worth noting, there is a difference between “lock” and “freeze”. See this article for the difference but I believe freezing is preferable https://krebsonsecurity.com/2018/09/credit-freezes-are-free-let-the-ice-age-begin/

Freezes are free now and my experience has been they are instantaneous for freezing and thawing.

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In my opinion it’s a needless extra step. I have had my card number compromised before and it was very little hassle to get a new card and my out of pocket was $0. Debit cards would be a completely different discussion however.