Sims can’t open fridge

Try selling the fridge and buying a new one and see if the issue remains.If the issue remains, try having your sims household travel to another lot then back again and see if that helps.

Unfortunately this didn’t work. 

Is this only happening with one household and home? If it is just one household, try deleting the fridge, then save the home to your library. Bulldoze the home, then place the home from your library back onto the lot. Buy a new fridge and see if the issue remains.