public static void removeReadPermission(String myObjectName, PermissionSet myPermissionSet){
    ObjectPermissions myObjectPermissions = new ObjectPermissions();
    myObjectPermissions.PermissionsRead = false;
    myObjectPermissions.PermissionsViewAllRecords = false;
    myObjectPermissions.SObjectType = myObjectName;
    myObjectPermissions.ParentId = myPermissionSet.Id;
    insert myObjectPermissions;
}

System.DmlException: Insert failed. First exception on row 0; first error: FIELD_INTEGRITY_EXCEPTION, You must enable at least one permission.: [Permissions]