I teach in year 3 and tie up the odd shoe lace. However I normally ask if the child has a really kind and helpful friend that can do it up for them. This is followed by loads of praise for that friend. As all the children want that praise they are all desperate to learn to tie shoe laces and practise at home. One vla child in particular won't to reading spelling or any homework. However he can now do his shoe laces and often stops playing at playtime to help antone with laces.