Short answer: prioritize safety first — clear the area, keep people and pets away, and temporarily cover the opening rather than trying to fix the glass yourself.
Immediate safety steps
Keep bare feet and hands away from the area until broken pieces are fully cleared with gloves and proper footwear. Sweep and vacuum thoroughly, since small shards spread further than they appear.
Temporary protection
Board up the opening with plywood or heavy cardboard and tape to keep out weather and secure the space until a professional can assess and replace the glass properly.
Don't do this yourself: attempting to remove or replace tempered or laminated glass without proper tools risks injury — this is a case where calling a professional quickly is genuinely the safer, and often cheaper, option.