Pausing animation at end of timeline instead of stopping?

I’m trying to pause an animation at the end instead of just stopping it, so I can still reverse the animation by setting a negative Play Rate. I can’t get this to work, am I doing this the right way?

I have some moving objects, imported from Maya, and I want to play and reverse the animation by pressing a button. Reversing works fine when the animation is halfway, but once it reaches the end, the animation stops, and changing the play rate doesnt work anymore.