Without knowing what model you have, I can only offer general advice, so here you go.
First off, look for any small holes in the front of the DVD drive; it's common for those to be manual eject mechanisms that are activated by sticking a straightened paper clip into the hole. It will push the DVD tray out slightly, at which point you can grab it with your fingers and gently pull it completely open.
[image|2903575]
Apparently some Samsung players have an eject hole on the bottom of the chassis under the DVD player. It's actually more of a slot that you stick a small screwdriver in and move it within the slot.
[image|2903576]
Move it in the direction shown.
[image|2903577]
Those are going to be the most likely ways to get it open, but the Free Video Workshop's page has several more suggestions to try.
[link|https://www.freevideoworkshop.com/open-a-dvd-player-tray-without-power-supply/|Open a DVD Player Tray without Power Supply to Remove a Stuck Disc|new_window=true]
Good luck; let us know what ends up working for you!