Caught in My Lie About the Coffee Break

So today at work was pretty dull, as usual. I had this nagging feeling that I really needed a break to clear my head and grab some fresh air. But honestly, we have these strict schedules and it's supposed to be like clockwork every day. No room for much flexibility... So yeah, I decided to fib a little bit. I told my boss that there was an urgent phone call from the client, something really important that needed immediate attention. Of course, everyone knows there’s no way a major issue would come up at 3 PM on a Tuesday afternoon when it's super quiet.... It felt weird saying it but it got me what I wanted - a little time to stretch my legs and clear out some mental cobwebs... But now the guilt is creeping in. Have I really become someone who justifies bending the truth for such a petty reason? Maybe this job is starting to get to me more than I thought...