Hi! I have a 12hr-layover in Beijing this month.

It's my first time so after my flights gets in at 2pm I would like to reach Tiananmen Square by 3pm and move on to Forbidden City by 3.30pm as it seems that's when ticket sales end? Then walk up Jingshan Park and round up with some dinner at Wangfujing before going back to the airport.
Does this sound reasonable/doable?
Thanks in advance!