Just slip the edge of a spoon of single fork prong under the cap and lift until the bottle opens. Alternatively, you could just use the handle to pry it off.
How do you open a Mexican Coke without a bottle opener?
How do I open jarritos?
you can use a sturdy spoon to knock off the cap. Firmly grasp the bottle’s neck near the top and wedge the bottom of the spoon between your index finger and the cap. Then, wedge the free end of the spoon down with your other hand.
How do you open a bottle cap with a key?
And the keychains they tend to come with can sometime afford helpful extra leverage. To open a beer using a key simply grip the neck of the bottle and position the key sideways under the cap (make sure the ridged side is under the cap) and the move the key up and down until the cap comes off.