How to unblock LDAP users that have been blocked automatically?

Our setup uses LDAP to authenticate a very large user base. To automatically block users from GitLab if their access right has been removed from LDAP, we use the rake task gitlab:cleanup:block_removed_ldap_users. This uses the method user.ldap_block if a user is not found in LDAP anymore, which seems to be irreversible.

Is there any way to unblock an user in GitLab if the access right has been granted again in LDAP? This doesn't have to be in any way automatic, but currently even unblocking an user manually is not possible in GitLab.