Locked filing cabinet

On returning from Hobart on Monday morning, I went straight to work. Of course, along the way I realised I had not packed my Dallas Button to be able to clear the security doors at work - not that big a drama - but then I realised the key to the filing cabinet was on the same lanyard, still languishing at home. It's only when you can't access something you use every day that you realise what's there: computer, smartbadge, coffee stirrers, hot chocolate, paper clips, scissors, business cards ... the list goes on. And every time I reached to open one of the drawers, I realised again that the cabinet was locked. D'oh. I'm going to work out a secure place to keep the key at work from now on.