Garden gate smart lock

geewhizz

So my garden gate lock has broken and I thought lets “smarten” up the new lock, rather than replace with the same old boring one,

I quite fancy something magnetic, Push button to exit but I don’t really fancy a keypad to enter,
Looking for something like a RFID, but the issue is we all have iPhones, so that may be a problem unless we can use a RFID sticker, stuck on the back of the phones to unlock?

The gate post is 4” and the gate is double sided slates so that takes the thickness to 4” also,
so looking to bolt on rather than route out a hole to fit a lock,

Also looking to do this as cheap as possible,
I can get a kit for about £25 but that has the key pad, (see photo)

What’s your recommendations.