Hack the reader. Install a device that clocks you in and out automatically or remotely. There have been a few defcon talks on how insecure these systems are.
Every company I've ever worked for has had a clause in the Employee Handbook saying any attempt to circumvent a company system is a fire-able offense. Doesn't matter if the company-wide firewall uses admin/admin as the user credentials. You get caught tinkering with it, you are out the door with cause.
Even in at will states (which, let's be honest here, plenty of cities have more people than the population of the only non-at-will state - Montana, so it's not really even worth the distinction) there is a pretty huge difference between being fired for having red shoelaces and being fired for physically adding a device to circumvent building security or removing a security implementation from your work PC.