Anyone know the trick to open SIM slot on Huawei P20 Lite?

I've been trying for hours - I could be daft, but I'm having no joy in opening the SIM slot on my Huawei phone.. Trying firmly, trying carefully... trying a wiggle, trying harsh shove. The git refuses to open. It's driving me mad.. and when I check the nearest stockist, it's of course closed on the weekend. D'oh!!!

Anyone know any tricks?

(oops... sorry... I'm trying with the little tool thing they give you, so I am trying with a metal stick in the hole that's "meant" to push it out. I'm failing... )