The Museum Box

Everything did go as planned.. Up until now!
As you enter the museum hallway that the precious gold brick is displayed, nothing seems the same as the plot of the building..
They have changed everything!
A barred door is blocking your way!
But behind it, you can still see it..
Shining and sparkling under the lights!
You try not to panic, but you already know that your time is running out!
Can you still find a way to steal the valuable object before it's too late?
You hear the ominous sound of footsteps coming closer and closer.. Its the guard!
Step, step, step..