“unlock”

18 symbols from Material Design Icons

lock-open

account-lock-open

lock-open-alert

lock-open-check

lock-open-minus

lock-open-outline

lock-open-plus

lock-open-remove

lock-open-variant

shield-lock-open

account-lock-open-outline

lock-open-alert-outline

lock-open-check-outline

lock-open-minus-outline

lock-open-plus-outline

lock-open-remove-outline

lock-open-variant-outline

shield-lock-open-outline