Can anyone please recommend a simple plug socket timer that ensures the power cuts after a set time? It’s for mums sandwich toaster. She forgets to turn the plug switch off. I need it to be simple. Needs to be set for a set time every use. Say 30 minutes. So if she forgets to switch the plug off after the time it takes to make her toastie (about 20 minutes) it switches off automatically at a later point. There must be nothing she has to do that’s unfamiliar so all she knows is next time she uses it, the switch is in off position ready to start again. She loves her toasties!! Despite the odd stuff she puts in them.