Draw out 2 circles with a dark fill: #555555. One circle being larger than the second. Then add a shape filled with black to connect the 2 circles. See Figure 1.
Figure 1: Background
Pen Tool
Add 2 anchor points to the shape with your Pen Tool then adjusting the control handles to get a curved shape.
Figure 2: Background
Copy the shape
Copy (or Clone)the black shape and flip vertically and align it. Now we have the shape of a key hole.
Figure 3: Background
Union
Select all 4 shapes and go to: Modify> Combine Paths> Union
Figure 4: Background
Shrink
Shrink to size, add a solid color and inner shaddows like below. Add some button shapes.
Figure 5: Background
Final Result
Add a bar.
Figure 6: Background
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