The local garage compressor (if like a tesco 20p job) is a croc o shite and won’t help….
You need a decent pump as well as technique.
I’ve had lots of success in recent times – mostly due to the B & Q compressor I bought for a hundred quid but I’ve also been successful with a 12V car compressor and a Joe Blow Track Pump.
Is the bead of the tyre quite tight in the middle of the rim with tape? If you’ve got a helper try the following:
1) Suspend the wheel off the ground – hooking it over the handle bars helps.
2) apply suds.
3) Get a helper to pump like crazy with a track pump or use a 12v car compressor whilst gently pushing on the tyre above the valve to get a good seal at least near the valve – you’ll know when this is achieve as you won’t hear the air escaping near the valve.
4) with your helper pumping away work around the tyre trying to pull the bead out and gently patting the tyre all the way round – the suds and hissing should show you where to focus
With any amound of luck it will suddenly inflate (fingers crossed)